Answers
Following is the classification of given substances:
Atomic element: AgMolecular element: F₂Molecular compound: COIonic compound: PbI₄What is difference between element and compound?An element is a pure substance containing only one type of atom whereas, compound contains more than one kind of atom. Elements are classified by their properties and compounds are classified by the type of bond. Symbols represent elements and compounds are defined by chemical formulas. Their atomic number identifies the elements. Compounds are separated by their atomic ratio. Chemical reactions cannot break-down elements, but they can break down compounds, which is the main difference between compound and element. There are several other factors that distinguish elements from compounds, such as total number, properties, composition, and examples. There are 118 distinct elements in the periodic table. There are countless connections. Elements held the properties of their parent atom. Compounds do not have specific properties and have different properties depending on the type of bond.
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Related Questions
Calculate the density of air at exactly 35°C and 1.00 atm (assuming that air is 80.0 percent N2 and 20.0 percent O2).
Answers
The density of air at exactly 35°C and 1.00 atm assuming that air is 80.0 percent N₂ and 20.0 percent O₂ is 1.139 g/L
How do I determine the density of the air?We'll begin by obtaining the average atomic mass of the air. This can be obtained as follow:
Molar mass of N₂ = 28 g/molAbundance of N₂ = 80%Molar mass of O₂ = 32 g/molAverage atomic mass of air =?Average atomic mass of air = (Molar mass of N₂ × abundance) + (Molar mass of O₂ × abundance)
Average atomic mass of air = (28 × 80%) + (32 × 20%)
Average atomic mass of air = 28.8 amu
Finally, we shall determine the density of the air. This is illustrated below:
Temperature (T) = 35 °C = 35 + 273 = 308 KPressure (P) = 1 atmGas constant (R) = 0.0821 atm.L/Kmol Average atomic mass of air (M) = 28.8 amuDensity =?Density = PM / RT
Density = (1 × 28.8) / ( 0.0821 × 308)
Density = 1.139 g/L
Thus, the density of the air is 1.139 g/L
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What is the molar mass of Cu(C104)2?
Answers
Cu(C104)2 is a complex ion made up of copper (Cu) and a large organic molecule known as a porphyrin. The porphyrin molecule contains four nitrogen atoms, four carbon atoms, and eight hydrogen atoms.
The atomic weight of copper is 63.55 g/mol, the atomic weight of carbon is 12.01 g/mol, and the atomic weight of hydrogen is 1.01 g/mol.
To find the molar mass of Cu(C104)2, we need to add up the atomic weights of all the atoms in the compound:
Molar mass = (1 mol Cu * 63.55 g/mol Cu) + (4 mol C * 12.01 g/mol C) + (8 mol H * 1.01 g/mol H) + (4 mol N * 14.01 g/mol N)
This simplifies to:
Molar mass = 63.55 g/mol + 48.04 g/mol + 8.08 g/mol + 56.04 g/mol
The molar mass of Cu(C104)2 is therefore 175.71 g/mol.
Upon reaction of 1.274 g of copper(II) sulfate with excess zinc metal, 0.392 g copper metal was obtained according to the equation: CuSO4 (aq) + Zn (s) Cu (s) + ZnSO (aq) What is the percent yield? (77.3%)
Answers
The Percent Yield=(Actual YieldTheoretical Yield)×100% = 77.3%
What does the term percent yield mean?A real yield divided by hypothetical yield multiplied by 100 is known as percent yield.Yield Percentage Equals Actual YieldA theoretical yield of 100%There are various reasons why a chemical reaction's theoretical yield might not match its actual yield, and these will be covered in more detail in later chapters of the course.
What formula is used to determine percentage yield?Percent yield = Actual Yield/Theoretical Yield x 100 is the formula we use to calculate the yield percentage.
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State amagat's law of combining volume. It mathematical and graphical representation
Answers
As long as the temperature T and pressure p stay constant, Amagat's equation asserts that the extensive volume V = Nv of a gas mixture equals the total of volumes Vi of the K component gases:: N v ( T , p ) = ∑ i = 1 K N i v i ( T , p ) .
What does the Amagat Law state?According to Amagat's law of partial volumes, the sum of the partial volumes that each gas would occupy if it existed alone at the mixture's temperature and pressure makes up the entire volume of a gas mixture.
What exactly is Amagat's partial volume law?According to Amagat's law of partial volumes, a mixture's volume is equal to the total of its component parts' partial volumes.
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The question that I need help with is in the photo
Answers
The volume of 0.240 M KOH to react completely with 11.4 ml of 0.110 M sulphuric acid is 5.225 ml.
What is molarity?Molarity of a solution is the ratio of the number moles of solutes to the volume of solution in liters. Molarity is most common term used to express the concentration of a solution.
Let the volume and molarity of the titrant be V1 and M1 respectively and the volume of molarity of the analyte be V2 and M2 then,
M1 V1 = M2 V2.
Given volume of H₂SO₄ = 11.4 ml
Molarity = 0.11 M
Molarity of KOH = 0.24 M
volume of KOH = (11.4 ml × 0.11 M) / 0.24 M
= 5.225 ml.
Therefore, the volume of KOH needed for the titration is 5.2 ml.
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The mass ratio of sodium to fluorine in sodium fluoride is 1.21:1. A sample of sodium fluoride produced 23.5 g of sodium upon decomposition. How much fluorine was formed?
Answers
19.42g of fluorine is produced upon decomposition of sodium fluoride.
What is mass ratio?The mass of a given substance is converted to moles using the molar mass of this substance in the periodic table. Moles of a given substance are then converted to moles of an unknown substance using the molar ratios from the balanced chemical formulas.
Mass ratio is defined as the percentage composition of the masses of elements in a molecule or compound. A compound always has a defined mass fraction of the corresponding element.
Mass ratio of sodium to fluorine = 1.21:1
If the mass of sodium fluoride produced is 23.5 g
Using dimensional Analysis,
(23.5g of sodium/sodium fluoride)×(1 g of Fluorine/1.21 g of sodium)
= 19.42g(g of fluorine/g of sodium fluoride)
Mass of fluorine produced = 19.42g
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Which of the following describes the hardness of a mineral that measures 9 on the hardness scale
Answers
The hardness of a mineral that measures 9 on the hardness scale can only be scratched using special equipment.
what are minerals?Minerals are naturally occurring solid materials that can be created from the combination of one or more elements (chemical compounds).
What is hardness in properties of minerals?One of the most helpful characteristics for classifying minerals is their hardness, or capacity to withstand being scraped. The ability of one mineral to scrape another mineral determines how hard something is. it is clear to note that by scratching a mineral against another substance with a known hardness on the Mohs Hardness Scale, one can determine a mineral's relative resistance to scratching.
what is mohs scale hardness of a mineral?The Mohs Hardness Scale is a practical tool for identifying minerals. When a mineral is scratched against another material with a known hardness on the Mohs Hardness Scale, its relative resistance to scratching is determined.
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Complete question
Which of the following describes the hardness of a mineral that measures 9 on the hardness scale?
(a) It rubs off your finger.
(b) It can be scratched with a nail.
(c) It can be scratched easily with a penny.
(d) It can only be scratched using special equipment.
Outline the steps needed to determine the limiting reactant when 0.50 mol of Cr and 0.75 mol of H3PO4 react according to the following chemical reaction. 2Cr + 2H3PO4 -> 2CrPO4 + 3H2
Answers
The theoretical yield of the reaction is 1.13 g. The acid H₃PO₄ is the limiting reactant.
Definition of the theoretical yield
The theoretical yield of a given chemical reaction can be obtained from the balanced reaction equation.
Number of moles of Cr = 0.50 g /52 g/mol = 9.6 × 10⁻³ moles
Number of moles of acid = 0.75 g/98 g/mol = 7.7 × 10⁻³ moles
Given that the reaction is 1:1, the limiting reactant would be the acid.
The theoretical yield that is obtained from,
Theoretical yield = Number of moles of product × Molar mass of product
Substitute the values to obtain,
7.7 × 10⁻³ moles × 147 g/mole = 1.13 g
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Experiment by hanging your first object (object 1) on the hook. Hold on to the cardboard, and position the cardboard and string so the object dangles just off the edge of the table. Then let go of the cardboard. If it moves, stop it when it reaches the edge of the table. Repeat the steps by replacing object 1 with object 2 on the hook. Finally, hang object 1 and object 2 together on the hook and repeat the steps. What do you observe when you hang different objects from the hook? What happens when two or more objects are on the hook together?
Answers
Answer:
makes now sense
Explanation:
How does wavelength change as frequency increases? Wavelength increases as frequency increases. Wavelength decreases as frequency increases. Wavelength is unaffected as frequency increases. Wavelength increases or decreases depending on how quickly frequency increases.
Answers
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, Wavelength decreases as frequency increases.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
c/λ = ν= frequency of electromagnetic wave
From above formula we can see frequency is inversely proportional to wavelength.
Therefore, Wavelength decreases as frequency increases.
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In order to produce sp3 hybrid orbitals, ________ s atomic orbital(s) and ________ p atomic orbital(s) must be mixed.
Answers
In order to produce sp3 hybrid orbitals, 1s atomic orbital(s) and 3p atomic orbital(s) must be mixed.
1 s, 3 p and 1 d orbitals of approximately the same energy intermix to produce sp³ hybrid orbitals and are used to create 5 identical or degenerate hybrid orbitals. These orbitals forms a trigonal bipyramidal symmetry by arranging themselves. In trigonal bipyramidal three orbitals are arranged in a trigonal plane and the other two orbitals are arranged up/down the trigonal plane at right angles.
For example, formation of PCl₅ requires five unpaired electron, the phosphorus atom was excited and one electron from the 3s filled one of the vacant 3d orbitals.
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A SEMI-PERMEABLE MEMBRENE
Answers
Semipermeable membranes are a type of polymeric, biological or synthetic membrane that permits certain ions or molecules to flow through them via osmosis.
What sort of membrane would be considered semipermeable?A thin membrane known as a semipermeable membrane allows certain tiny molecules to flow through but not others. A semipermeable membrane can be a small piece of cellophane.
What does it mean to be semi-permeable?Semi implies some or a small amount, and permeable means able to let anything through. Consequently, a semi-permeable screen is one that only permits specific substances to flow through. Different from membrane pores, which let all materials flow through the barrier, are semi-permeable membranes.
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If an atom has sp2 hybridization in a molecule:
The maximum number of σ bonds that the atom can form is
The maximum number of p-p bonds that the atom can form is
Answers
According to the molecular geometry, there are 3 maximum number of σ bonds that the atom can form and 2 maximum number of p-p bonds that the atom can form .
What is molecular geometry?Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
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Part 1: Name the type of chemical reaction that occurs when aluminum (Al) reacts with copper nitrate (Cu(NO3)2).
Part 2: Explain why aluminum does not react with potassium nitrate (KNO3) although it reacts with copper nitrate.
Answers
Aluminium cannot replace potassium because potassium is more reactive than aluminium. And the response won't take place.
What is Displacement Reaction?
Chemistry's most crucial chemical reactions are displacement reactions. They are applied in a variety of settings and contexts. For instance, electroplating, which is based on displacement reaction, is used to stop iron objects from rusting.
Displacement reactions are those in which a portion of one reactant is replaced by another reactant. Another name for it is a replacement reaction. as another reactant ion takes the place of one ion that was previously present.
For instance, Fe+CuSO4FeSO4+Cu
One element is replaced by another in a compound in a single displacement reaction, which is also known as a single replacement reaction.
Chlorine takes the place of bromine when it is introduced to a solution of sodium bromide in gaseous form (or as a gas dissolved in water). Chlorine, which is more reactive than bromine, causes sodium bromide to lose bromine, which causes the solutions to turn blue. The bromine that is displaced gives the colour brown. The Cl and Br have been switched around in the equation, as can be seen.
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For each of the following descriptions, decide if the material is likely to be a mixture or a pure compound or element, and then decide if the process is a chemical or a physical change. a) A clear, colorless, crystalline solid is heated. A pale yellow-green gas is given off and a shiny, malleable metal was left behind. b) A brown liquid is heated and a colorless, aromatic liquid is produced along with a clear, colorless liquid while a brown liquid is left behind in the container. c) Adding sugar to tea causes the tea to taste sweeter. d) A shiny, dark gray metal and a clear colorless gas combine to form a flaky orange solid.
Answers
Option A, B and D are chemical changes and Option C is a physical changes
Physical and Chemical changes:
A change in physical attributes accompanies a physical change. Melting, turning into a gas, changing strength or durability, changing crystal structure or texture, and changing shape, size, color, volume, or density are a few examples of physical qualities.Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they often cannot be reversed except by other chemical reactions.Nothing about the original crystalline solid remains in the produced gas and metal. The crystalline solid was therefore a combination that disintegrated into its constituent parts. Chemical changes will result from this process.Water-soluble tea components are combined to make tea. A physical shift occurs when sugar is added to tea. Sugar does not interact with the chemicals in tea; rather, it just sweetens the solution and combines its qualities with those of the compounds.Hence, Option A, B and D are chemical changes and Option C is a physical changes
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Calculate the cell potential for the galvanic cell in which the given reaction occurs at 25 °C, given that [Sn2+]=0.0610 M , [Fe3+]=0.0389 M , [Sn4+]=0.00744 M , and [Fe2+]=0.01196 M . Standard reduction potentials can be found in this table.
Sn2+(aq)+2Fe3+(aq)↽−−⇀ Sn4+(aq)+2Fe2+(aq)
Answers
The cell potential of the system is obtained as 0.66 V.
What is the cell potential?We know that we can be able to make use the table of the standard potentials so as to be able to obtain the cell potentials under standard conditions.
We have that;
The standard cell potential can be obtained as;
Cell potential of the cathode - Cell potential of the anode
0.77 V - 0.15 V
= 0.62 V
By the Nernst equation;
E = E° - 0.0592/n log Q
E = cell potential under the given conditions
n = Number of electrons transferred
E° = standard cell potential
Q = reaction quotient
Then;
Q = [0.00744] [0.01196]/[0.0610] [0.0389]
= 8.9 * 10^-5/2.4 * 10^-3
= 3.7 * 10^-2
Thus;
E = 0.62 - 0.0592/2 log (3.7 * 10^-2)
E = 0.66 V
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画喵區
6.
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A scientist is testing milk for the presence of bacteria. Exactly 25 milliliters of a test solution
must be added to each milk sample. Which of these instruments would most accurately measure
the volume of the test solution?
250ml
-250
-200
-150
-100
50
Answers
The test solution's volume is most precisely measured using a graduated cylinder.
What are mass and volume?A three-dimensional object's volume is the area it takes up, and it is expressed in cubic units. Cm3 and in3 are two instances of cubic units. The amount of matter in an item may be estimated by its mass, on the other hand. The weight of an object is a typical way to determine mass (in units like pounds or kilograms).
What does water volume mean?Water has a capacity of one cubic centimeter per milliliter (1 mL) (1cm3). The dimensions and weights of certain atoms differ. The amount of protons in an atom's nucleus determines the sequence in which specific atoms appear on the periodic table.
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A quantity of nitrogen gas is enclosed in a tightly stoppered 500 mL flask at room temperature (20.0 °C) and 0.836 atm pressure. The flask is then heated to 680 °C. If the flask can withstand pressures up to 3 atm, will it explode under this heating? (In other words, what is the final pressure?). Remember to convert between °C and K.
Answers
Will the flask explode if the pressure is less than 3 atm if it can tolerate pressures up to that level.
Is nitrogen beneficial to the body?To create the proteins found in your muscles, skin, blood, hair, nails, and DNA, your body needs nitrogen. According the Royal Society of Chemistry, your diet's protein-containing foods are where you get your nitrogen. Meat, fish, beans, nuts, eggs, milk, and other dairy items are some of these foods. Nitrogen exposure is hazardous because it can displace oxygen and induce asphyxia.
Briefing:The formula below is used to determine the pressure at a given temperature for a given volume of nitrogen gas:
P₁/T₁ = P₂/T₂
where;
Initial pressure is P1.
Initial temperature is T1.
Final pressure is P2.
T2 is the final temperature.
P2 solution
P₂ = P₁ * T₂ / T₁
P₂ = 0.836 * (680 + 273) / (20 + 273)
P₂ = 2.72 atm =3atm
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(8 marks)
2. Calculate the pH of a buffer prepared by mixing HA with NaA. The buffer contains HA at a
concentration of 0.25 mol L-¹ After 0.20g NaOH is added to 100mL of this buffer, the pH of the
resulting solution is 5.60. The acid-ionization constant of HA is 5.0x106.
(10 marks)
Answers
Answer: To calculate the pH of the buffer, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])
where pKa is the acid-ionization constant of HA, [A-] is the concentration of the conjugate base (A-) in the solution, and [HA] is the concentration of HA.
First, let's calculate the concentration of A- in the solution after 0.20 g of NaOH is added. The molecular weight of NaOH is 40 g/mol, so the number of moles of NaOH added is 0.20 g / 40 g/mol = 5.0 x 10^-3 mol. The conjugate base of HA is A-, so the number of moles of A- produced is equal to the number of moles of NaOH added. The concentration of A- in the solution is the number of moles of A- divided by the volume of the solution, which is 100 mL = 0.1 L. Therefore, the concentration of A- in the solution is 5.0 x 10^-3 mol / 0.1 L = 5.0 x 10^-2 mol/L.
Next, let's plug these values into the Henderson-Hasselbalch equation:
pH = 5.0 x 10^6 + log(5.0 x 10^-2 mol/L / 0.25 mol/L)
pH = 5.6
This is the same as the pH of the resulting solution, so our calculation is correct.
Please someone can help me to fill out??
Answers
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, blanks can be filled with the knowledge of types of chemical compound.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Covalent compounds are formed by elements whose electronegativity difference is null. These compounds have low melting and boiling point.
Therefore, blanks can be filled with the knowledge of types of chemical compound.
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Which of the following are valid reasons you must repeat the standard curve (calibration plot) for crystal violet this week? I The spectrophotometer may not be the same instrument as last week. II The cuvette will not be the same as last week. III, A spectrophotometer may give different results on different days. a. I and III only b. I and II only c. II and III only d. I, II, and III
Answers
Option c) is correct . The cuvette will not be same as last week or spectrophotometer may give different results on different days.
What is calibration plot?
This curve is used in analytical chemistry for the determination the concentration of an unknown sample solution.
Some errors might get during measurements
1. didn't wait for instrument to calibrate. (Before showing 0.00 have placed cuvette in it)
2. Not handled the cuvette in correct way.
3. May changed the cuvette. (Size of cuvette)
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What human activity is the primary of acid rain?
Answers
Answer:
Power plants - sulfur dioxide and nitrogen oxides when they burn fossil fuels, such as coal, to produce electricity.
- The exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air.
Explanation:
Your lab has a 50 X TAE stock solution. You are asked to prepare 30.0 mL of a 1X working solution. How many milliliters of the 50 X stock solution do you need to mix with deionized water to make 30.0 mL of a 1X solution?
What volume of water is needed?
amount of TAE stock solution?
Answers
0.6 ml volume of water is needed to make the stock solution.
What is stock solution?A stock solution is made by weighing out the right amount of a pure solid or measuring out the right amount of a pure liquid, adding it to an appropriate flask, and diluting it to a specified volume. The precise method of measuring the reagent is determined by the intended concentration unit.
Given that,
In lab 50 X TAE stock solution is present.
Thus, C₁ = 50 X
prepare 30.0 mL of a 1X working solution.
So, C₂ = 1 X
V₂ = 30.0 ml.
As we know,
C₁V₁ = C₂V₂
(50 X) × V₁ = (1 X) × (30.0 ml)
V₁ = [(1 X) × (30.0 ml)] / 50 X
V₁ = 0.6 ml.
Thus, 0.6 ml volume of water is needed.
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3. Copper (II) sulfide (CuS) is formed when 48.2 grams of copper are added to 35.0 grams of
sulfur.
Which reactant is the limiting reagent?
How much product is formed?
How much excess reagent remains?
(9 pts. total / 2 pts. for equation - 4 pts. for stoich - 2 pts. for limiting reagent - 1 pt. for excess
reagent.)
Answers
1. The limiting reagent would be sulfur.
3. The amount of product formed would be 34.4 grams
2. The amount of excess copper that remains would be 24.96 grams.
Sotichiometric problemCopper and sulfur react to form copper (II) sulfide according to the following balanced equation:
[tex]Cu + S -- > CuS[/tex]
From the balanced equation of the reaction, the mole ratio of copper to sulfur is 1:1.
Recall that, mole = mass/molar mass
Mole of 48.2 grams of copper = 48.2/64
= 0.75 mol
Mole of 35.0 grams of sulfur = 35/98
= 0.36 mol
Since the stoichiometric mole ratio is 1:1, it means that sulfur is the limiting reactant or reagent while copper is in excess.
The excess amount of copper would be: 0.75 - 0.36 = 0.39 mol
Mass of 0.39 mol copper = 0.39 x 64 = 24.96 grams
With sulfur being the limiting reactant, the equivalent amount of CuS formed will be 0.36 mol considering that the mole ratio is 1:1.
Mass of 0.36 mol CuS = 0.36 x 95.6
= 34.4 grams.
In other words, the limiting reactant is sulfur, the amount of product formed is 34.4 grams, and the amount of excess copper is 24.96 grams.
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Given: S03(g) + H20(1) -> H2SO4(1); AH° = -130. kJ
determine AH° for the following thermochemical equation.
5H2S04(1) -> 5S03(8) + 5H20(1)
Answers
Considering the definition of enthalpy of reaction, the enthalpy change for the reaction is 650 kJ.
Enthalpy of reactionThe enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.
Enthalpy in this caseIn this case you want to calculate the enthalpy change of:
5 H₂SO₄ → 5 SO₃ + 5 H₂O
You know the following reaction, with his corresponding enthalpie:
SO₃ + H₂O → H₂SO₄ ΔH = –130 kJ
To obtain the enthalpy of the desired chemical reaction you need 5 moles of H₂SO₄ on reactant side. The given equation has 1 mole of H₂SO₄ on the product side, soit is necessary to locate it on the reactant side (invert it) and multiply it by 5.
When an equation is inverted, the sign of delta H also changes. And since enthalpy is an extensive property, that is, it depends on the amount of matter present, since the equation is multiply by 2, the variation of enthalpy also.
In summary, you know that the enthalpy change is 650 kJ.
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In 1909 Fritz Haber reacted Nitrogen with hydrogen to produce 76.3 grams of ammonia. How many grams of hydrogen reacted?
N2(g) + 3H2(g) → 2NH3(g)
Question 5 options:
13.5 grams
4.8 grams
16.9 grams
21.2 grams
Answers
Answer:
13.5 g.
Explanation:
76.3 g NH3 contains 4.49 mol NH3. This comes from (3/2)4.49 mol H2 = 6.75 mol H2, or 13.5 g hydrogen.
I need it ASAP thank you
Answers
The classification of given substances is as follows:
Ag is the Atomic element.
F₂ is the Molecular element.
CO is the Molecular compound.
PbI₄ is the Ionic compound.
What are ionic compounds?Crystalline solids are formed by tightly packed ions of opposite charge. Ionic compounds are usually formed when metals react with non-metals. Elements can gain or lose electrons to reach the next noble gas configuration. The formation of ions (by gaining or losing electrons) to complete octets helps them stabilize.
In reactions between metals and nonmetals, metals generally lose electrons to complete octets, while nonmetals gain electrons to complete octets. Metals and non-metals generally.
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Which is true regarding the following reaction that occurs when aqueous solutions of Kl(aq) and Pb(NO3)2(aq) are mixed? 2 Kl(aq) + Pb(NO3)2(aq) -> 2 KNO3(aq)+ PbI2(S) I. I is a spectator ion
II. NO3, is a spectator ion III. Pbl2 precipitates IV. KNO3, precipitates O A. I and II B. I and III
C. I and IV D. II and III
E. II and IV
Answers
(D. II and III) A precipitate of PbI2 will form near the center of dish. The potassium (K+) and nitrate ions (NO3-) are considered "spectators" because both are present but neither participate in the reaction.
What ions are always spectator ions?Compare the solutions before and after the reaction, sodium and nitrate ions should present in both solutions. They do not undergo any chemical change. These ions are called spectator ions as they don't participate in the chemical reaction.
Are spectator ions always soluble?Itty rules is always soluble. Therefore, it will always be a spectator ion, ,which is ammonia young. According to, Itty rules always makes the compound soluble, so it will always also serve as a spectator ion.
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what is the advantage of periodic table
Answers
Answer: It is easier to remember the properties of an element if its position in the periodic table is known.
Explanation:
how many sugar molecules are present in 300mL of a 2.0 m solution
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The amount of sugar molecules present in 300mL of a 2.0M solution is 3.61 × 10²³ molecules of sugar.
How to calculate number of molecules?The number of molecules of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³).
According to this question, 300mL of a 2.0M solution is given. The molarity of the solution can be calculated as follows:
no of moles = 0.300 × 2.0 = 0.6moles
no of molecules = 0.6mol × 6.02 × 10²³
no of molecules = 3.61 × 10²³ molecules of sugar.
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