One cubic centimeter of 7.15 g/cm³ will contain 9.2 x 10²² Cr atoms.
The density of Cr is 7.15 g/cm³.
It means, one cm³ contains 7.15 grams of Cr.
We know moles are given by,
n = mass/molar mass
n = number of atom/Avogadro number
Molar mass of Cr is 51 g/mol.
So, the number of atoms per cubic centimeter can be found as,
7.15/51 = Number of atom/6.603 x 10²³
Number of atoms = 9.2 x 10²²
So, one cubic centimeter will contain 9.2 x 10²² atoms of Cr.
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What is the bonding order of Li2?
Answer:bond order of one
Explanation:
The dilithium molecule is shown in the final diagram (Li2). The bonding orbital is filled by the 2s electrons rather than the 1s electrons, who are not involved in the bonding. Li2 has a bond order of 1 and is a molecule that is stable in the gas phase.
The number of chemical bonds that exist between two atoms is known as bond order.
Dilithium (Li2)
Bond Number = 2
Bonding electrons = 0 and anti-bonding electrons = 1
The p electrons entirely occupy the bonding orbital without the 1s electrons participating in bonding, leaving the antibonding orbital empty and resulting in a bond order of 1, suggesting a stable molecule (in this case, in the gas phase).
Lithium possesses 3 electrons in its neutral state because of its atomic number. Li2 will also have six electrons. However, the chemical formula we are given (Li2) has a negative charge, hence this compound also contains an additional electron (RED). Consequently, there are 7 electrons in all. The following diagram represents the MOT for this chemical. As seen in the diagram, we have four electrons in bonding molecular orbitals (BMO) and three in anti-bonding molecular orbitals (ABMO)
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When determining the mass of an atom, the electrons are not considered. Why can scientists disregard the electrons?.
When determining the mass of an atom, scientists disregard electrons is because they are 2000 times smaller than protons and neutrons. They are meaningless in terms of mass.
What is atomic mass?
The ideal definition of atomic mass is 1/12 of the mass of a carbon-12 atom in its ground state. The total mass of protons and neutrons, which is almost equal to the atomic mass, can be used to account for the mass of an atom. The loss of binding energy mass is what caused this minor alteration.
1 amu = 1.66 ×10−24 g
When divided by unified atomic weight or Daltons, the atomic weight of an atom is a dimensionless number.
Compared to the masses of the proton and neutron, which both have 1.67 10^-27 mass, the electron has a mass of 9.1 10^-31. since electrons are much smaller and have far less mass than a nucleus. This allows for the ignoring of the electron mass.Another explanation is that, in order to achieve stability, an electron of any element may be transferred from one orbital of any one element to another orbital of any other element during the production of any compound. As such we do not factor the mass of the electron into atomic mass for this reason.Another explanation for why the mass of any atom is unaffected by the electron is that electrons are always in motion. Since electrons move around the nucleus at an extremely fast rate—even faster than the speed of light—causing their mass to be turned into energy. According to a quantum physics hypothesis, when an item travels at square of the speed of light, it loses mass, turns into energy, and is no longer affected by gravity.To learn more about atomic mass from the given link
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was the experimental mole ratio exactly the same as the theoretical mole ratio? if not, give some possible reasons.
No, the experimental mole ratio is exactly the same as the theoretical mole ratio.
A mole ratio is a ratio among the amounts in moles of any compounds worried in a balanced chemical reaction. The stability chemical equation affords a comparison of the ratios of the molecules necessary to finish the response.
The mole ratio is the proportion of the theoretical mole ratio, of moles of any two chemical entities concerned in a compound or a chemical reaction. studying the mole ratio is crucial to calculate the reaction yield, determining the stoichiometry, and screening the response kinetics.
The ratio of moles of 1 substance to the moles of another substance in a balanced equation. To decide the mole ratio between materials, all you want to do is examine the balanced equation for the coefficients in the front of the materials you are interested in
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A sample of gas has a volurne of 215cm^(3) at 23.5\deg C and 84.6kPa. What volume will the gas occupy at STP?
The volume that a gas will occupy at a volume of 215cm³ and a temperature of 23.5°C is 0.165L.
How to calculate volume?
The volume of a given gas can be calculated using the combined gas law equation as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁, V₁ and T₁ are the initial pressure, volume and temperature respectively.P₂, V₂ and T₂ are the final pressure, volume and temperature respectively.At standard temperature and pressure (STP), the following applies;
P = 1atmT = 273K0.215 × 0.835/296.5 = 1 × V/273
0.0006055 × 273 = V
V = 0.165L
Therefore, 0.165L is the volume of the gas at STP.
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the stanley miller apparatus demonstrated that organic molecules could assemble spontaneously in an environment lacking free oxygen and containing water, methane, and ammonia in the presence of an abundant energy source, such as an electric discharge. the research was considered supportive of the organic soup hypothesis, which states that the primitive atmosphere provided inorganic precursors from which organic molecules could have been synthesized in the presence of an energy source. based on subsequent research, the primordial atmosphere was determined to contain less methane and more carbon dioxide. the new data about the composition of the early atmosphere had which of the following effects on origin-of-life hypotheses?
The Stanley miller apparatus demonstrated , The new data about the composition of the early atmosphere had which of the following effects on origin-of-life hypotheses : A new organic soup hypothesis was proposed to account for the new data for the atmosphere.
The Stanley miller hypothesis proposed the evolution of life on the earth. from the several theories the acceptance is on soup theory. The organic soup theory proposed the new data for the atmosphere also called as primordial soup theory.
Thus, The Stanley miller apparatus demonstrated , The new data about the composition of the early atmosphere had which of the following effects on origin-of-life hypotheses : A new organic soup hypothesis was proposed to account for the new data for the atmosphere.
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What is the concentration of a 600 mL solution that contains 250 grams of iron (II) chloride?
The molar concentration of a 600 mL solution that contains 250 grams of iron (II) chloride would be 3.28 M.
What is concentration?The concentration of a solution is the amount of solute present in the solution relative to the volume of the solution. The concentration of solutions can be expressed in different forms. These include:
Molar concentrationMass concentrationThe molar concentration of a solution refers to the number of moles of solutes per liter of the solution. The mass concentration, on the other hand, refers to the mass of solutes in a solution per liter of the solution.
In this case, we want to find the molar concentration of the iron (II) chloride solution.
The molar mass of the compound is 126.75 g/mol.
Recall that: mole = mass/molar mass
Mole of 250 grams iron (II) chloride = 250/126.75
= 1.97 moles
Volume of the solution = 600 mL
= 600/1000 liter
= 0.60 liter
Molar concentration of the solution = 1.97/0.60
= 3.28 mol/liter
In other words, the concentration of the solution is 3.28 M.
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Under what conditions of temperature and pressure would you expect gases to obey the ideal-gas equation?.
Gases obey the ideal-gas law at high temperatures and low pressures.
What is the ideal gas law?
The equation of state for a hypothetical ideal gas is known as the ideal gas law, sometimes known as the general gas equation. Although it has some restrictions, it is a good approximation of the behavior of numerous gases under various circumstances.
PV = nRT
where,
P = pressure
V = volume
n = amount of substance
R = ideal gas constant
T = temperature
Hence, the gases are expected to obey the ideal gas equation at low pressures and high temperatures.
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g a certain diatomic molecule absorbs energy by rotating. the first excited rotational state is at an energy of 0.10 ev above the ground state. what is the energy of the second excited rotational state above the ground state
0.30 ev is the energy of the second excited rotational state above the ground state .
What is energy ?
In physical, energy are quantitative properties given to a body or physical system, perceivable in the form of work performance and heat and light. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed. The unit of measure for energy in the International System of Units (SI) is the joule (J).
Common forms of energy include the kinetic energy of a moving object, the potential energy stored by an object (due to its position in the field, etc.), the elastic energy stored by a fixed object, chemical energy, the energy associated with a chemical reaction, Includes radiation. is the energy transported by electromagnetic radiation and is the internal energy involved in a thermodynamic system. All living things absorb and emit energy all the time. Due to the equivalence of mass and energy, an object that has mass when it is at rest (called rest mass) has an equivalent amount of energy with a shape called rest energy plus an additional amount given to the object above that rest energy. It also has energy (in any form). Increases the object's total mass and increases its total energy.
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In your lab, the mass of your product is less than the mass of your reactants. You recall that atoms are not created or destroyed in a chemical reaction, they are just rearranged from the reactants to form the products. You are afraid you have misunderstood something, so you ask your teacher for some help. She reminds you that if a chemical reaction is completed in a closed system then the mass will remain constant. But if the chemical reaction happens in an open system the mass may appear to change. What can account for this apparent difference?
A The chemical reaction is in a closed system and the reactants
are all solid, while the products are liquid.
B The chemical reaction is in an open system and the reactants
are all liquid, while the products are solid.
C The chemical reaction is in an open system and a gas is being
released into the atmosphere.
D The chemical reaction is in a closed system and a gas is being
used as a reactant.
As per the given statement the right answer is C, The chemical reaction is in an open system and a gas is being released into the atmosphere.
What is a chemical reaction?A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.
Now ,The Law of Conservation of Mass States that Mass cannot be created nor destroyed, it can only change form.
In a chemical reaction, the sum of the masses of the reactants and products remains unchanged.
So, whenever there is a change in the mass of product it is the result of occurring in the open system and some of its paricle(mass) may escaped in the form of gas or during conversion of state.
Hence, the right answer is C, The chemical reaction is in an open system and a gas is beingreleased into the atmosphere.
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Which resource is a nonrenewable resource?
Responses
nuclear energy
nuclear energy
lumber
lumber
water power
water power
solar energy
solar energy
When preparing a solution in a cuvette, make sure to handle the cuvette by the choose. And avoid touching the choose. . Then, choose. The cuvette before placing it in the spectrophotometer.
When preparing solutions in cuvettes, handle the cuvettes by the rough side and avoid touching the smooth side. Wipe the cuvette before inserting it into the spectrophotometer.
The cuvette is made of silica quartz. Therefore, care should be taken before using cuvettes. Always wear powder-free gloves when handling cuvettes. Fingerprints are the most common cause of cuvette malfunction and unreliable readings. The cuvette should always be held at the top of the cuvette to avoid damaging the bottom of the cuvette where the light enters.
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dot and cross diagram for lithium chloride
Lithium becomes Li+ by losing 1 electron and chlorine becomes Cl− by accepting electrons. Therefore it ionic compound, LiCl is formed.
What is the dot and cross diagram for lithium chloride?Lithium belongs to Group 1 of the periodic table which means that Lithium has one electron in its valence shell and this electron is located in the 2s orbital. The single electron is represented as dot around the Lithium symbol.
The ionic bond formation of lithium chloride involves transfer of electrons from lithium to chlorine and forming, Li+ and Cl− in LiCl.
A bond between metal and nonmetal is said to be ionic in nature or is said that it has high ionic character. Therefore, we can say that LiCl bond is an ionic bond.
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how many ingredients are acidic or basic in this image of (MISWAK TOOTHPASTE -TUBE)
The ingredients are classified below as acidic or basic as follows:
Acidic: Sodium Lauryl Sulfate, Carrageenan, Glycerin, Methylparaben, Propylparaben, Eugenol, Sorbitol,
Basic: Calcium carbonate, Aqua, Silica, Aroma (Flavour), Salvadora persica (Miswak/Al-Arak) extract, Cellulose gum (Sodium Carboxy Methylcellulose), Sodium Silicate, Sodium Benzoate, Sodium saccharin,
What are acids and bases?Acids are substances that produce hydrogen ions as the only positive ion when dissolved in water.
Acids can also be defined as substances that donate a proton.
Substances that are acidic have a pH of less than 7.
Bases are substances that react with acids to produce salt ad water only.
Bases can also be defined as substances that accept a proton.
Substances that are basic have a pH of less than 7.
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How do you think global terrorim affected Ilam a a religion in the eye of the world?
Many factors make it extremely difficult to analyze patterns in terrorism. Simply said, there is a severe paucity of comparable and trustworthy data, and there is a tendency to compartmentalize analyses to address specific threats, countries, and regions. When the analysis tries to address topics as sensitive as the connections between Islam and terrorism, the issue becomes even worse.
How Islam is affected as a religion by the global terrorism?Nearly all of the governments of the engaged nations are actively battling terrorism, and the majority are allies of Western nations who collaborate closely with the security, armed forces, and anti-terrorist organizations of non-Muslim nations.
Muslims around the world differ greatly not just in terms of their religious beliefs but also in terms of their political and societal philosophies, including how they perceive the government, the law, and human rights; what they believe should be taught in schools; and whether or not they are violent.
Thus, global terrorism has affected the Islam as a religion in the eye of world.
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An atom of which element has the strongest attraction for the electrons in a bond?.
An atom of Fluorine element has the strongest attraction for the electrons in a bond.
One of the most important properties of electrons is their mutual Coulomb repulsion. As electrons are negatively charged species we know that they will be attracted to the nucleus. We know that these electrons moved in their fixed energy levels called as the orvbitals ,which in turn decides the size of an atom as well.
In the periodic table as we move from left to right in the periodic table we see that the even though the number of electrons are increasing, but the size of the atoms will decrease. This happens because for each atom when the upcoming electrons are added they get added to the same shell . Due to this the nucleus will attract these electrons towards itself.
This is the main reason why from left to right in the periodic table the size of the atoms decreases, so it means smaller the size greater will the attraction faced by the electrons . Since Fluorine is the element present on the right most corner of the periodic table, it has the strongest attraction faced due to its smaller size.
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Vinegar solutions are often labeled as being 5% by mass "acidity. " assuming that the density of vinegar is equal to the density of water, calculate the molarity of "acidity" in the vinegar.
the molarity of "acidity" in the vinegar is 0.00386 .
What is molarity ?
Molarity (also called molarity, bulk concentration, or substance concentration) is a measure of the concentration of a chemical species, especially a solute, in solution, expressed as the amount of substance per unit volume of solution. In chemistry, the most commonly used unit of molarity is moles per liter, symbolized in SI units as mol/L or mol/dm3. A solution with a concentration of 1 mol/L is called 1 molar, commonly called 1 M.
Molarity or molarity is most commonly expressed in moles of solute per liter of solution. For broader use, it is defined as the amount of solute material per unit volume of solution, or per unit volume available to a species, and is expressed in lower case.
this %mass means:
basis --> 100 g of solution, then 5 g are vinegar
assume d = 1 g/ml then we have V = 100 ml of solution
m = 5 g of Acetic acid
MW of acteic Acid = 60
mole = mass/MW = 5/60 = 0.08333 mol of acetic acid
By definition
M = mol/V = 0.0833/0.1 = 0.8333 M of Acetic acid
Ka = 1.8*10^-5
Ka = [H+][A-]/[HA]
1.8*10^-5 = (x)(x) / (0.8333-x)
x = [h+]
solve for H+
[h+] = 0.00386
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In the process of carbon fixation, rubp attaches a co2 to produce a 6 carbon molecule, which is then split in two. After phosphorylation and reduction, what more needs to happen in the calvin cycle?.
The Calvin cycle is the regeneration of RuBP.
For the technology of one carbon dioxide molecule from the pathway, six carbon molecules are required, so six turns of the cycle are required for the regeneration of 1 molecule of RuBP one ATP is required and for the technology of six molecules of RuBP, six ATP molecules are required. A G3P molecule carries three constant carbon atoms so it takes two G3Ps to construct a six-carbon glucose molecule.
Due to the fact the carbohydrate molecule has six carbon atoms, it takes six turns of the Calvin cycle to make one carbohydrate molecule. Six turns of the Calvin cycle are required to generate one mole of glucose. A molecule of glucose is made up of six carbon molecules. consequently, six turns will be required for the synthesis of 1 molecule of glucose by way of the Calvin cycle.
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statement about a global environmental indicator is not correct? concentrations of atmospheric carbon dioxide has steadily increased since the industrial revolution world grain production has steadily increased since the 1950s, but worldwide
The statement which is not correct about global environment indicator is that global grain production has grown continuously since 1950, but grain production per person has fallen sharply over that time.
What is the explanation for this statement?Global grain output has increased since 1950 as a result of enhanced irrigation, fertilization, new variety of crops, and other advancements. Global grain production has dropped, but, per person. The increase in the human population is to blame for this. The distribution of enough food per capita declines as the amount of habitats rises.
Therefore, despite a reasonably consistent increase in global grain production since 1950, grain production per person has fallen sharply throughout that time. However, this does not indicate the global environment as do the other options.
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The complete question is:
Which statement regarding a global environmental indicator is NOT correct? (a) Concentrations of atmospheric carbon dioxide have been rising quite steadily since the Industrial Revolution. (b) World grain production has increased fairly steadily since 1950, but worldwide production of grain per capita has decreased dramatically over the same period. (c) For the past 130 years, average global surface temperatures have shown an overall increase that seems likely to continue. (d) World population is expected to be between 8 billion and 10 billion by 2050.
What mass of calcium hydroxide is formed when 10g of calcium oxide reacts with 10g of water.
Mass of calcium hydroxide is formed when 10g of calcium oxide reacts with 10g of water is 13.024 gram
Mass is a measure of the amount of matter in a substance or an object.
Here given data is
Calcium oxide = 10g
Water = 10g
We have to calculate mass of calcium hydroxide = ?
The reaction is
CaO + H₂O → Ca(OH)₂
1 mole of CaO reacted with 1 mole of H₂O to form 1 mole of Ca(OH)₂
Moles = mass/molar mass
Mole of CaO = 10g/56g/mol = 0.179 mole
Mole of H₂O = 10g/18g/mol = 0.556 mole
CaO is the limiting reagent therefore by using of mole ratio of CaO : Ca(OH)₂ is 1 : 1 mole of Ca(OH)₂ = 0.179 mole
Mass = mole × molar mass
Mass = 0.176 × 74g/mol
Mass = 13.024 gram
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Place the following compounds in order of increasing magnitude of lattice energy. Al2o3 cao kf mgo.
The compounds in order of increasing magnitude of lattice energy are KF < CaO < MgO < Al2O3.
What is the lattice energy?When ions in the gаseous phаse form а solid ionic compound, it releаses energy which defines the bond strength of thаt ionic compound. This strength, which cаn be estimаted using the Born-Hаber cycle, is cаlled the lаttice energy. Generаlly, it is influenced by fаctors such аs the rаdius аnd the chаrge of the ions, аnd it helps chаrаcterize the properties of the compound such аs its hаrdness, volаtility, аnd solubility.
Lattice energy is determined by the charge on the atoms making up the lattice and by the atomic radii of those atoms.
KF has 808 kJ/Mol of lattice energyCaO has 3414 kJ/Mol of lattice energyMgO has 3795 kJ/Mol of lattice energyAl2O3 has 14.780 kJ/Mol of lattice energyThus, in order of increasing lattice energy, we have KF < CaO < MgO < Al2O3.
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Please classify the following equation: Na₂O + H₂O → 2NaOH
combustion
double replacement
single replacement
synthesis
decomposition
Answer:
Explanation:
Synthesis
predict the product(s) and provide a fully balanced chemical equation for each of the following hydrogenation reactions:
The product of the fully balanced chemical equation is single bond compound.
Hydrogenation reactions include the reaction of hydrogen and nitrogen to form product depending on the choice of catalyst.
Hydrogenation is a chemical reaction that provides hydrogen to a molecule. Hydrogenation is not thermodynamically favorable at regular temperatures, so a catalyst is needed. Normally this catalyst is a metal. Examples of hydrogenated products consist of margarine, mineral turpentine, and aniline.
An example of an alkene addition response is a technique called hydrogenation. In a hydrogenation reaction, two hydrogen atoms are brought across the double bond of an alkene, ensuing in a saturated alkane.
Hydrogenation is used to solidify, preserve or purify many products, raw materials, or ingredients. Ammonia, fuels (hydrocarbons), alcohols, pharmaceuticals, margarine, polyols, numerous polymers and chemicals are products dealt with using a hydrogenation manner.
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Disclaimer:- your question is incomplete, please see below for the complete uestion.
predict the product(s) and provide a fully balanced chemical equation for each of the following hydrogenation reactions:
In the nineteenth century, this material became both less costly and more widely available for construction.
a. glass
b. iron
c. concrete
d. steel
e. all of the other answers
In the nineteenth century, this material became both less costly and more widely available for construction all of the other answers. Option E.
This historic Mycenaean stone building constructed around 1250 BCE, uses a corbeled arch to span the entryway. This architectural production technique includes two uprights and a crossbeam. A vault is an arched overhead shape that provides a space with a ceiling or roof just like the arch the vault has been around seeing ancient instances.
Set-up art is one of the most effective and immersive of all artwork paperwork. In comparison with conventional mediums along with painting and sculpture, set-up artwork is designed to fill complete rooms or maybe whole gallery spaces. however, it become the Romans who created a rigid stable structure that didn't need any external buttresses or help.
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What is the name of the compound with the formula PI3 ?
Answer:
im pretty sure its Phosphorus triiodide
determine whether each of the following compounds is soluble or insoluble: drag the appropriate items to their respective bins. you did not open hints for this part. cu3(po4)2
Cu3(PO4)2 (Copper (11) Phosphate)
→ Inorganic compound.
→ It is cupric salt of phosphoric acid.
→ Insoluble in water and ethanol.
Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.
Solubility indicates the maximum amount of a substance that can be dissolved in a solvent at a specific temperature. Such a solution is called saturated. Solubility is the formation of new bonds between solute and solvent molecules. In terms of quantity, solubility is the maximum concentration of a solute that will dissolve in a solvent of known concentration at a given temperature.
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A 20.0-gram cube of ice at 0.00°C is dropped into a calorimeter containing 120.
grams of water at 35.0°C. The ice eventually melted, and the water reached an
equilibrium temperature of 18.1°C. Based on this data, what is the heat of fusion, in
joules per gram, of water?
The heat of fusion for water is 79.7 J/g. This can be determined by using the specific heat capacity of water and solving for the heat of fusion.
What is fusion?
Fusion is the process of two atoms coming together to form a heavier atom, including when two hydrogen atoms combine to form a single helium atom. The sun is powered by this process, which produces vast amounts of energy—many times more than fission. Additionally, no radioactive fission products are produced. The extreme temperature and pressure needed to fuse the nuclei together are being studied by scientists, but they are difficult to sustain for long periods of time.
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a sample of an ideal gas at 12.4 atm and 15.0 l is allowed to expand against a constant pressure 3.00 atm at a constant temperature. what is the work done (in kj) by the expanding gas?
A sample of an ideal gas at 12.4 atm and 15.0 l is allowed to expand against a constant pressure 3.00 atm at a constant temperature. -13.2kJ is the work done (in kj) by the expanding gas.
What is Constant temperature ?Since the heat energy created during a state change is used up by altering the state of matter as well as by breaking many bonds or attractive forces, the temperature of any substance stays constant during the process.
Isothermal processes are defined as those that occur at constant temperature. There are many isothermal processes that are used often. At constant temperatures, the working fluid undergoes a change in phase during the boiling and condensing processes.
That's right; using Boyle's Law to determine V2 requires P2, which is based on the constant external pressure of 2.00 atm.
But after that, you must look for a job. w= P(ΔV)
Constant pressure = 3.00 atm
Since the gas is releasing energy, our pressure is negative in this situation.
Consequently, w= -2.00atm*(65L)= -130Latm
But because the inquiry requests working in kJ, it must first be transformed to J before kJ.
-13.169J/1000J/kJ = -130L/atm (101.3J/L/atm)
So the final answer is -13.2kJ .
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What mass of glucose (c6h12o6) should be dissolved in 10.0 kg of water to obtain a solution with a freezing point of -4.2 ∘c ?
The mass of glucose required here is 4068 grams, we get this freezing point depression.
Freezing point depression generally refers to the lowering of the freezing point of solvent upon the addition of solutes.
It is a colligative property of the solutions that is generally proportional to the molality of solute that is added. The depression in the freezing point of a solution can be described by the following formula;
Δ[tex]T_{f}[/tex] = [tex]K_{f}[/tex] × molality × i
4.2[tex]^{o}C[/tex] = 1.86 × m × 1
m = 2.26
molality = moles of solute
mass of solvent
2.26m = mole of solute
10.0Kg
mole of solute = 22.6mol
mole of glucose = mass of glucose
molar mass
22.6 = mass of glucose
180
Mass of glucose = 22.6 × 180
Mass of glucose = 4068 grams
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A student dissolves 13. g of stilbene (C14H12) in 100. mL of a solvent with a density of 0.85 g/mL. The student notices that the volume of the solvent does not change when the stilbene dissolves in it.
The molarity and molality of the student's Stilbene solution is 0.72 M and 0.85 m.
Molarity is calculated by the formula - number of moles of solute ÷ volume of solution in litres
Molality is calculated by the formula - number of moles of solute ÷ mass of solvent in kilograms
Molar mass of Stilbene = 180 gram/mole
Number of moles = mass ÷ molar mass
Number of moles = 13 ÷ 180
Performing division
Number of moles = 0.072 mol
Volume of solution= 100 ml
As per the fact, 1000 ml = 1 l
Volume = 0.1 l
Mass of solvent = volume × density
Mass of solvent = 100 × 0.85
Mass of solvent = 85 gm
1000 gm = 1 kg
85 gm = 0.085 kg
Molarity = 0.072/0.1
Molarity = 0.72 M
Molality = 0.072/0.085
Molality = 0.847 m
Molality = 0.85 m
Thus, the molarity and molality is 0.72 M and 0.85 m.
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The complete question is attached in the diagram.
Choose the statement that best completes the sentence.
Whether a substance is a gas, liquid, or solid is dependent on the natural attractive forces between molecules and
how the molecules collide with the container.
the collisions between the molecules.
the kinetic energy of the molecules
the extent of molecular motion as determined by the average KE and temperature.
none of the above
The statement that best completes the sentence "whether a substance is a gas, liquid, or solid is dependent on the natural attractive forces between molecules and" is: the kinetic energy of the molecules;
Hence, the correct option is D.
What are intermolecular forces?Intermolecular forces are forces of attraction that exist between molecules of the same substance that enable the substance to exist in different states of matter.
The stronger the intermolecular forces between the molecules of a substance, the more ordered the particles of the substance will be.
Hence, solids have the strongest intermolecular forces whereas gases have the weakest intermolecular forces.
Learn more about intermolecular forces at: https://brainly.com/question/13588164
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