The change in internal energy for a molecule at 56 g/mol is discovered to be -539 kJ/mol.
The internal energy change of a reaction is represented by the symbol U. U = Heat of calorimeter + Heat of solution for a reaction in the bomb calorimeter.
Heat capacity = Heat Temperature
For example, 0.48 g compound U = 3.81 0.285 + 4.184 3000 0.28 g compound U = 4.67 kJ
For a molecule at 56 g/mol
U equals energy/mass/moles/one, where U = 4.67/0.48556 and U = 539 kJ/mol.
Since the reaction causes a temperature increase, the internal energy, or -539kJ/mol, is given a negative sign.
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what mass of sodium phosphate is required to prepare 250.0 ml of a solution that is 0.30 m in sodium ion?
4.1g of sodium phosphate is required to prepare 250.0 ml of a solution that is 0.30 m in sodium ion.
The important thing to note here is that each mole of trisodium phosphate ([tex]Na_{3}PO_{4}[/tex]) gives us 3 moles of Na ions. So a solution that is 0.30 M in sodium ion is only 0.10 M in [tex]Na_{3}PO_{4}[/tex].
Now, molarity is moles/L, so we can figure out the total number of moles we need:
0.10 mol/L × 0.250 L = 0.025 moles [tex]Na_{3}PO_{4}[/tex].
Finally, the MW of [tex]Na_{3}PO_{4}[/tex] = 164 g/mol.
So: 0.025 moles × 164 g/mol = 4.1 g
So you would need 4.1 g of trisodium phosphate to make 250 mL of this solution.
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PLS ANSWER ASAP
How are natural resources managed for maximum usability and sustainability?
After the equation below has been balanced for a reaction in an acidic solution, what will the coefficients of the reactants and products be, in order?
H2O2 + FeSO4 + H2SO4 →Fe2(SO4)3 + H2O
a. 1,2,1,1,2
b. 2,2,2,2,2
c. 2,1,2,2,1
d. 1,2,1,1,1
Answer:
c
Explanation:
english please im just guessing
Hat solution can you add to of the mixture of sr2 (aq)sr2 (aq) and hg22 (aq)hg22 (aq) to precipitate one cation while keeping the other cation in solution?
SrCl₂ is soluble salt to precipitate one cation while keeping the other cation in solution.
What is cation & anion?Cations are ions that are polarized. Anions are the name for negatively charged ions. Ions are charged atoms or molecules. If one or more of an atom's electrons are removed, it will transform from a balanced atom together into positive charges cation. If an unbalanced atom gains one or more electrons, it will transform into a negatively charged anion.
Briefing:Due to mercurous, we can dilute any solution containing chloride ions to use as a NaCl solution.
Hg₂²⁺ is made up of group I cations that precipitated as chloride Sr²⁺ is from group V .
Net ionic equation:
Hg₂²⁺ + 2 Cl⁻ → Hg₂Cl₂
while SrCl₂ is soluble salt.
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What is the name of the ion represented by the following
symbol? 02-
a oxygen ion
b dioxide
Coxide
d none of the above
explain the pauli exclusion principle and what it means for the nine electrons in an atom of fluorine. you do not need to write out all 9 sets of quantum numbers for fluorine.
Along with the Aufbau principle and Hund's rule, the Pauli Exclusion principle is one of the key concepts governing the arrangement of electrons in an atom.
According to the Pauli exclusion principle, no two electrons may simultaneously hold the same set of quantum numbers or quantum states. A distinct quantum number and set of quantum states should exist for every electron.We learned from the definition of the Pauli exclusion principle that no two electrons with the same spin can be placed together at once, and no two electrons with the opposite spin can be ordered in a single quantum state. The Pauli exclusion principle is just as significant in chemistry as it is in physics.
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Consider these two electron configurations for neutral atoms l and m. L - 1s22s22p63s2 m - 1s22s22p63s13p1 what is the atomic number of l 10 12 1 6.
The atomic number will be 12 and the element is magnesium.
What is electronic configuration?
Also called electronic structure ,it is the arrangement of electrons in orbits around the nucleus. The electron configuration of atoms in quantum mechanical models is given by ordering the occupied orbitals in order of packing, with the number of electrons in each orbital indicated as a superscript.
What is atomic number?
The atomic number, or atomic number of a chemical element, is the number of electric charges in the nucleus. For normal atomic nuclei, this equals the number of protons, or the number of protons found in the nucleus of each atom of that element.
Therefore, the atomic number will be 12 and the element is magnesium.
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which type of test should be used to determine if lab 1 is reporting lower cholesterol levels, on average, than lab 2?
A cholesterol test is a blood test that quantifies your blood's levels of cholesterol and certain fats. Every cell in your body, including the ones that make up your blood, contains cholesterol, a waxy, fatty-like substance.
What are the most common chemistry tests?Elevated blood ammonia (BUN) and creatinine are measured during kidney function testing, often known as renal panels. Aspartate analyzer (ALT), alkaline phosphatase (ALP), transaminase (AST), bilirubin, albumin, and total protein are all measured in liver function tests.
Why are lab tests necessary?In patients suffering from viral infections or immunological disorders, scientific tests are particularly helpful in establishing a diagnoses, predicting clinical symptoms, and tracking disease progression. In the management of diseases, timely diagnostic evaluation and the use of accurate tests are crucial.
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at constant temperature and pressure, 5.0 l of so2 is combined with 3.0 l of o2 according to the equation: 2 so2(g) o2(g) --> 2 so3(g) after the so3 formation is complete, what is the volume of the mixture?.
The volume of the mixture is 5 L
What is limiting reagent ?The limiting reagent is the one that is completely consumed during a reaction. Reagents that are entirely consumed by a chemical reaction are known as limiting reagents. They are additionally known as limiting reactants or limiting agents.
Reactants in a chemical reaction are referred to as surplus reagents if they are still present at the end of the reaction. Because its quantity restricts the number of products that can be generated, the reagent that is totally consumed or reacted is known as the limiting reagent.
We should first use the mole ratio, and SO 2 as the limiting reagent .
That would yield 5.0 L or 2 moles of SO3, but that is not one of your options. Since the temperature and pressure are both constant, the volume is equal to the number of moles since n/v = p/rt.
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The cell potential of an electrochemical cell with the cell reaction 2al(s) + 3zn2+(aq) → 3zn(s) + 2al3+(aq) is 1. 607 v. What is the maximum electrical work obtainable from this cell when 0. 50 g of al is consumed?
The cell potential of an electrochemical cell with the cell reaction is 1. 607 v. the maximum electrical work obtainable from this cell when 0. 50 g of al is consumed is - 9.3 × 10⁵ J.
The reaction is given as :
2Al + 3Zn²⁺ ----> 3Zn + 2Al³⁺
the maximum electrical work obtainable from this cell:
ΔG = - n FE°cell
where,
maximum electrical work = ΔG
n = no. of transfer electron = 2 × 3 = 6 e⁻
E°cell = 1.607 V
ΔG = - n FE°cell
ΔG = - 6 × 9.65 × 10⁴ × 1.607
ΔG = - 9.3 × 10⁵ J
Thus the maximum electrical work obtain from this cell is - 9.3 × 10⁵ J.
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Help me please I beg me
which type of building material can produce toxic gases and rapidly deteriorate under fire conditions?
Engineered wood products type of building material can be highly combustible and produce toxic gases when exposed to fire.
Its construction materials exhibit a variety of flaws and stone degradation patterns, including color fading, spalling, and flaking.
Materials comprised of wood fibers connected by glue or binders may be extremely flammable, release hazardous fumes, or degrade quickly when exposed to fire. Building firewalls involves using walls.
In North America, wood is the most widely used building material and the foundation of many different structural systems. Wood's response to fire conditions is influenced by its size and moisture content.
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WHAT IS THE CHEMICAL FORMULA FOR inorganic benzene
Answer: B3N3H6
Explanation:
I am pretty sure the formula for benzene is B3N3H6. If I am wrong, I am sorry, I learned this a long time ago.
a steel tank contains 40.0 g of n2, 50.0 g of o2, and 10.0 g of he gases at a total pressure of 8.0 atm. what is the partial pressure (in atm) of he in the tank?
The partial pressure of He in the tank when total pressure is given is calculated as : 3.649 atm.
What is partial pressure?When a container is filled with more than one gas, then each gas exerts pressure. So , the pressure of any one gas within the container is called its partial pressure.
Given 40 g of N2 ; 50 gm of O2 and 10 g of He
Total pressure given 8 atm
Moles of O2 = 50/32
=1.56 moles
Moles of N2 = 40/28
= 1.42 moles
Moles of He = 10/4
= 2.5 moles
Total number of moles= 1.56 + 1.42 + 2.5
= 5.48 moles
= (2.5/5.48) * 8
Partial pressure of He =3.649 atm.
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What can a person do to limit exposure to x-rays?wear sunblockavoid cigarette smokewear a protective vestavoid chemicals.
X-rays are a form of indirectly ionizing radiation, and it can be really harmful to the humans health, so limiting the exposure is always a priority. Here, wearing a protective vest is the correct answer.
X-rays are a type of radiation that ionizes indirectly. Remember that ionization is what harms our cells, thus it is best to minimize exposure to these radiation types.
Now when X-rays are strong enough, they can penetrate through many ordinary materials (like wood, plastic, etc.) Also, once it enters in your body, a series of responses begin that cannot be stopped by outside forces.
Therefore, you should try to minimize your exposure. If possible, avoid being close to an X-ray source, but if that's not possible, use radiation protection.
Depending on the application, it can come in many shapes. For example, you can use LED screens to block out the fluence (flux of photons) that is focused at you. By placing these screens between you and the source, you can significantly reduce this fluence.
The same is true with protective vests that shield you from photons by absorbing them. These vests can include parts made of lead or other high atomic number materials.
So, a person can wearing a protective vest to limit exposure to X-rays.
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use the fiagram below to answer the following questions: a list the phase changes a sample of ice would go through if heated to its critical temperature and 1 atm pressure
calculate the ph of a buffer in which the concentration of hocl is 6.50 x 10-4 m and that of naocl is 7.50 x 10-4 m. the ka of hocl is 3.0 x 10-8. show work. pay attention to significant figures.
The pH of a buffer in which the concentration of HOCl is 6.50 x 10⁻⁴ M and that of NaOClis 7.50 x 10⁻⁴ M( the ka of HOCl is 3.0 x 10⁻⁸) is 7.51.
We can find out the pH of the buffer solution by Henderson-Hasselbalch equation, derived by Lawrence Joseph Henderson and Karl Albert Hasselbalch. It is given as:
pH = pKa + log [A⁻] / [HA]
Here,
pH is the acidity of the solution
pKa is the negative logarithm of Ka (ionization constant of acid)
[A⁻] is the concentration of salt/ conjugate base
and [HA] is the concentration of acid.
given,
concentration of NaOCl, [A⁻] = 7.50× 10⁻⁴ M
concentration of HOCl [HA] = 6.50 × 10⁻⁴ M
Ka of HOCl = 3.0 × 10⁻⁸
∵ pKa = -log(Ka)
pKa = -log(3.0 × 10⁻⁸)
pKa= 7.45
Putting these values in Henderson-Hasselbalch equation:
pH = 7.45 + log 7.50× 10⁻⁴ M/6.50 × 10⁻⁴ M
pH = 7.45 + log 7.50/6.50
pH = 7.45 + log 1.15
pH = 7.45 + 0.06
pH = 7.51
Thus, the pH of the buffer is 7.51.
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What is this called??
Calculate the kinetic energy of the cart at the point shown below. It has a mass of 225 kg, is 10 m high, and is moving at a velocity of 2 m/s.
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the kinetic energy of the cart is 450J. Average kinetic energy is directly proportional to temperature.
What is kinetic energy?
It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of object= 225 kg
v= velocity of object= 2 m/s
substituting all the given values in the above equation, we get
K.E=1/2×225 ×2²
K.E=450J
Therefore, the kinetic energy of the cart is 450J.
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1. What is the charge of an atom with 20 protons and 18 electrons
write and balance the chemical equation for the reaction associated with the heat of formation for agno3
The balanced chemical equation for the reaction associated with the heat of formation for [tex]AgNO_{3}[/tex]
Decomposition is a type of chemical reaction when a single reactant breaks down into two or more different products. The term "thermal decomposition process" refers to the decomposition method used when heat is present.
The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.
Enthalpy of formation = Enthalpy change 1 mole of product formed from its original constituents.
[tex]Ag(s) + \frac{1}{2} N_{2}(g) + \frac{3}{2}O_{2} \rightarrow AgNO_{3}[/tex]
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calculate the rf value for a spot in a chromatography experiment if the solvent moved 14.2 cm and the spot moved 9.9 cm from the origin.
Rf will be 0.697
Retention factor can be defined as;
The ratio of distance travelled by substance to the distance travelled by solvent. Substances start at the origin. The starting point of the compound is called the origin. This is where we measure the distance moved by the substance.
According to the question;
The given data is:
spot distance = 9.9 cm
solvent distance = 14.2 cm
We will have to find the retention factor value:
Rf = ?
The formula to find Rf is as follows;
Rf = spot distance / solvent distance
Rf = 9.9 cm / 14.2 cm
The answer after the solution is :
Rf = 0.697
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Which of these describes a way in which humans could increase biodiversity in a marine ecosystem?
A. Fish populations increase as dissolved oxygen decreases.
B. Data that shows how trees get affected by disease as levels of acid rain increases.
C. Data showing how forests grow when acidic precipitation decreases.
The statement that describes a way in which humans could increase biodiversity in a marine ecosystem is as follows: Fish populations increase as dissolved oxygen decreases (option A).
What is biodiversity?Biodiversity is the diversity (number and variety of species) of plant and animal life within a region.
It can be used more specifically to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans.
Marine ecosystem are aquatic environments with high levels of dissolved salt. These include the open ocean, the deep-sea ocean, and coastal marine ecosystems, each of which has different physical and biological characteristics.
The biodiversity of a marine ecosystem can be illustrated by the increase in fish populations in the marine environment, hence, option A is correct.
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how much excess reactant is left over when 17.0g of potassium hydroxide (KOH) reacts with 20.0g of iron(II) nitrate
Iron(II) nitrate is an excess reactant left over is equal to 0.1265 mol.
What is the limiting reagent?A limiting reagent can be defined as a reactant that is completely finished from the reaction mixture at the completion of a reaction and is also referred to as a limiting reactant.
Given, a balanced chemical equation of the reaction between iron(II) nitrate and potassium hydroxide is:
[tex]Fe(NO_3)_2 +2KOH\longrightarrow Fe(OH)_2 +2KNO_3[/tex]
Given, the amount of the iron(II) nitrate = 20.0 g
The molecular mass of the iron nitrate = 71.84 g/mol
The number of moles of iron(II) nitrate = 20.0/71.84 = 0.278 mol
Given the mass of the potassium hydroxide, = 17.0 g
The number of moles of potassium hydroxide = 17/56.11 = 0.303 mol
If 2 mole of KOH react with iron(II) nitrate = 1
0.303 mol of KOH react with iron(II) nitrate = 0.303/2 = 0.1515 mol
Therefore, iron(II) nitrate is an excess reagent.
The iron(II) nitrate is left after reaction = 0.278 - 0.1515 = 0.1265 mol
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If you dissolve 10. 0 g of compound x in 100. 0 ml of distilled water, the liquid turns red. The temperature of the liquid stays at 24 °c for 10 minutes. Why would you not want to sell a cold pack made with compound x?.
so the company hire company B because it pays not more than 85 cents.
Why would you not want to sell a cold pack made with compound x?
1. Technically it depends upon the temperature of your hand: if we assume the body temperature is 37 C then your hand is warmer than the beaker and the beaker will feel cold.
2. This is an endothermic reaction.
3. If the beaker changes from 25 C to 5 C the energy is lower.
1.5g x (20/5) = 6.0 grams.
Cost of 6.0 g is
$184.04 x (6.0/1000) = about $1.10 each.
its cost = 110 cents
Compound B the same way.
1.0g x (20/2.5) = 8.0 grams.
Cost of 8.0 g is
$97.13 x (8.0/1000) = about $0.777 each.
its cost 77.7 cents.
so the company hire company B because it pays not more than 85 cents.
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Match the general type of chemical reaction to the example that best fits it.
A. Na + cl2 -> NaCl
B. H2O -> H2 + O2
C. C6H12O6 + O2 -> H2O + CO2 + energy
D. Al(OH)3 + Li -> LiOH + Al
E. HCl + NaOH -> NaCl + H2O
__Combustion reaction
__ Single replacement
__Double replacement
__Synthesis
__Decompostion
The classifications of the reactions are;
A . Synthesis
B. Decomposition
C. Combustion reaction
D. Single replacement
E. Double replacement
What is the type of reaction?We know that in chemistry, what we call a reaction has to do with the interaction that is taking lace between two or more substances and leads to the production of a new substances. We have to look at the reacts that are here and then know how to classify each one.
In fact the combustion reaction has to do with the burning of a species in air. A single replacement has to do with the substitution of a given specie in a compound with another. A double replacement reaction has to do with a case where the anions interchange cation partners. The synthesis reaction deals with the production of new compounds while the decomposition reaction has to do with the compound into its components.
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for each value of the principal quantum number n, what are the possible values of the electron spin quantum number ms ? (there may be more than one correct choice.)
There can be no zero for the main quantum number (n). Therefore, the permitted values for n are 1, 2, 3, 4, and so forth. Any integer between 0 and n – 1 can serve as the angular quantum number (l).
How is the n quantum number determined?The value of n is between 1 and the outermost electron shell of that atom. Looking at the period (numbered row) of the element on the periodic table will reveal the primary quantum number. The period number and the primary quantum numbers of electrons in the S-block and P-block are identical.
There are three values if n=3 is the primary quantum number. The electron is in a p-orbital state when l=1, and the electron.
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(a) what is the total random kinetic energy of all the molecules in one mole of hydrogen at a temperature of 300 k? (b) with what speed would a mole of hydrogen have to move so that the kinetic energy of the mass as a whole would be equal to the total random kinetic energy of its molecules?
Total random kinetic energy of all the molecules in one mole of hydrogen at temperature of 300 K is 3741.3 J. Speed with which a mole of hydrogen have to move so that kinetic energy of the mass is equal to the total random kinetic energy of its molecules is 7482.6 m/s
What is kinetic energy of gas molecule?According to kinetic theory, average kinetic energy of gas molecules depends on the absolute temperature. At given temperature, molecules of all the gases have same average kinetic energy".
Kinetic energy = 3/2 * R T
= 3/2 * 8.314 * 300
= 3741.3 J
KE = 1/2 * m v²
v² = 2 KE/m
= 2* 3741.3 /1
Speed = 7482.6 m/s
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A 2000 ml sample of water was collected and found to have 0.004 mL of oxygen. This is equivalent to?
The sample of water containing 0.004 ml of oxygen in 2000 ml of water is equivalent to 2× 10⁻⁴ volume percentage of the solution.
What is volume percentage?Volume percentage of an aqueous solution is the ratio of the volume of the dissolved substance to the total volume of the solution. Volume percentage is thus, used to express the concentration of the solution in terms of its volume.
The other terms used to express the concentration of a solution are molarity, normality, mass percentage, ppm etc.
Given the total volume of the water sample = 2000 ml
volume of oxygen dissolved in water = 0.004 ml
volume percentage = volume of oxygen / total volume ×100
= 0.004 /2000 ×100 = 2× 10⁻⁴
Therefore, 2000 ml water sample containing 0.004 ml of sample is equivalent to 2× 10⁻⁴ volume percentage.
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carbon monoxide gas is collected at in an evacuated flask with a measured volume of . when all the gas has been collected, the pressure in the flask is measured to be . calculate the mass and number of moles of carbon monoxide gas that were collected. round your answer to significant digits.
Number of moles of carbon monoxide gas that were collected is 0.585 mol and the mass of carbon monoxide gas is 25.7 g
In an evacuated flask with a measured volume of 30.0L, carbon dioxide gas is collected at a temperature of 27.0 °C. The pressure within the flask is 0.480atm once all the gas has been collected.
Determine the volume and moles of the carbon dioxide gas that was gathered. Make sure you have the right number of significant digits in your response.
T = 27.0°C ˖ 273.15 = 300.2 K
V = 30.0 L
P = 0.480 atm
n = ?
m = ?
Determine the number of moles of CO₂
The ideal gas equation can be used to determine the moles of CO₂.
P×V = n×R×T
n= (P×V)/(R×T) = (0.480×30.0)/(0.08206×300.2) = 0.585 mol
Calculate the CO₂ mass.
The molar mass is calculated to be 44.01 g/mol.
0.585 × 44.01 = 25.7 g
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