L-2 CHEM - MOLES PACKET NAME: _______________________________ Per ________PAGE 1

L-2 Chemistry Moles Packet

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Mole-Particle Practice Worksheet

1 mole of particles = 6.02 x 1023 particles(Particle is the generic word that we use in chemistry for: molecule, formula unit, ion, atom,

etc.)Hints:

Always begin by writing out the formula for any compound in the problem. Remember to give your answer to the correct number of significant digits

Part One: One Step Conversion1. How many formula units are there in 2.45 moles potassium chloride?

2. How many molecules are there in 31.8 moles of water?

3. How many moles are 2.85 x 1018 atoms of iron?

4. How many moles are 9.05 x 1022 ions of chloride?

5. How many formula units are in 3.55 moles of aluminum sulfate?

6. How many moles of copper are 4.57 x 1013 atoms of copper?

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7. How many formula units of magnesium hydroxide are found in 5.88 moles?

8. 4.5 x 1016 molecules of carbon dioxide are equal to how many moles?

Part Two: Multi-Step Conversions

9. How many ions of fluoride are there in 0.23 moles of iron(III) fluoride?

10. 4.50 moles of sodium sulfate contain how many atoms of sulfur?

11. 2.3 x 1024 ions of silver are found in how many formula units of silver carbonate?

12. How many atoms of carbon are found in 4.7 x 1025 molecules of carbon monoxide?

13. There are 8.57 x 1026 atoms of phosphorous in how many moles of diphosphorous pentoxide?

14. How many atoms of chlorine are in 2.00 x 1010 moles of carbon tetrachloride?

15. How many total ions are found in 12.6 moles of copper(I) sulfite?

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Molar Mass WorksheetCalculate the molar masses of the following chemicals:1) Cl2

2) KOH

3) BeCl2

4) FeCl3

5) BF3

6) CCl2F2

7) Mg(OH)2

8) UF6

9) SO2

10) H3PO4

11) (NH4)2SO4

12) CH3COOH

13) Pb(NO3)2

14) Ga2(SO3)3

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Mole Calculation Worksheet1) How many moles are in 15 grams of lithium?

2) How many grams are in 2.4 moles of sulfur?

3) How many moles are in 22 grams of argon?

4) How many grams are in 88.1 moles of magnesium?

5) How many moles are in 2.3 grams of phosphorus?

6) How many grams are in 11.9 moles of chromium?

7) How many moles are in 9.8 grams of calcium?

8) How many grams are in 238 moles of arsenic?

What are the molecular weights of the following compounds?

9) NaOH 12) H3PO4

10) H2O 13) Mn2Se7

11) MgCl2 14) (NH4)2SO4

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15) How many grams are in 4.5 moles of sodium fluoride, NaF?

16) How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

17) How many grams are in 0.02 moles of beryllium iodide, BeI2?

18) How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)2?

19) How many grams are in 3.3 moles of potassium sulfide, K2S?

20) How many moles are in 1.2 x 103 grams of ammonia, NH3?

21) How many grams are in 2.3 x 10-4 moles of calcium phosphate, Ca3(PO3)2?

22) How many moles are in 3.4 x 10-7 grams of silicon dioxide, SiO2?

23) How many grams are in 1.11 moles of manganese sulfate, Mn3(SO4)7?

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Moles Worksheet1) Define “mole”.

2) How many moles are present in 34 grams of Cu(OH)2?

3) How many moles are present in 2.45 x 1023 molecules of CH4?

4) How many grams are there in 3.4 x 1024 molecules of NH3?

5) How much does 4.2 moles of Ca(NO3)2 weigh?

6) What is the molar mass of MgO?

7) How are the terms “molar mass” and “atomic mass” different from one another?

8) Which is a better unit for expressing molar mass, “amu” or “grams/mole”?

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Moles, Molecules, and Grams Worksheet1) How many formula units are there in 24 grams of FeF3?

2) How many formula units are there in 450 grams of Na2SO4?

3) How many grams are there in 2.3 x 1024 atoms of silver?

4) How many grams are there in 7.4 x 1023 formula units of AgNO3?

5) How many grams are there in 7.5 x 1023 molecules of H2SO4?

6) How many formula units are there in 122 grams of Cu(NO3)2?

7) How many grams are there in 9.4 x 1025 molecules of H2?

8) How many formula units are there in 230 grams of CoCl2?

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9) How many formula units are there in 2.3 grams of NH4SO2?

10) How many grams are there in 3.3 x 1023 molecules of N2I6?

11) How many molecules are there in 200 grams of CCl4?

12) How many grams are there in 1 x 1024 molecules of BCl3?

13) How many grams are there in 4.5 x 1022 formula units of Ba(NO2)2?

14) How many formula units are there in 9.34 grams of LiCl?

15) How many grams do 4.3 x 1021 formula units of UF6 weigh?

16) How many formula units are there in 230 grams of NH4OH?

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Calculating Molar Volumes & Density of a Gas at STP – 10.2

Volume of a Gas = Moles of Gas X 22.4L grams = grams X 22.4L 1 mol mol L 1 mol

Answer the following questions below. Show all work.1. Calculate the volume of the following gases at STP:

a. 0.45 mol H2

b. 5.47 X 10-3 mol O2

c. 45.3 mol C3H8

d. 2.23 mol Ne

e. 4.3 mol H

2. Calculate the moles present in the following gases at STP:a. 1.2 L of He

b. 3.2 L of CO

c. 0.028 L of Cl2

d. 0.51 L of CH4

3. How many grams are present of the following gases at STP:a. 5.2 L of CO2

b. 0.43 L of N2

4. Calculate the density of the following gases at STP:a. He

b. Cl2

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c. CO2

5. The density of gas is 1.21 g/L at STP. What is the molar mass of the element?

6. What is the molar mass of a gaseous compound with a density of 3.25 g/L at STP?

7. The densities of gases of three different gases are as follows: Gas A = 1.25 g/L Gas B = 2.86 g/LGas C = 0.714 g/L

Calculate the molar mass of each substance. Identify each substance as carbon monoxide (CO), sulfur dioxide (SO2), or methane (CH4).

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Molecular Formula WorksheetWrite the molecular formulas of the following compounds:

1) A compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole.

2) A compound with an empirical formula of C4H4O and a molar mass of 136 grams per mole.

3) A compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole.

4) A compound with an empirical formula of C2H8N and a molar mass of 46 grams per mole.

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Chapter 10 – Review

Calculating Molar Mass:1. Calculate the molar mass of the following compounds:

a. Cu2S

b. NaOH

c. (NH4)2SO4

Single-Step Conversions2. Convert 3.45 moles of NH4 into grams of NH4.

3. Convert 4.6 grams of Li into moles of Li

4. Convert 87 L of N2 into moles.

5. Convert 2.3 moles of H2 gas into liters of H2 gas.

6. Convert 7.2 X 1024 atoms of Zn into moles of Zn

7. Convert 0.75 moles of NaCl into formula units of NaCl

Multi-Step Conversions8. Convert 535 g of PCl3 into molecules of PCl3.

9. Convert 63g of CO2 into number of liters of CO2.

10. Convert 8.3 L of Ne gas into molecules of Ne

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Density Conversions11. What is the density of a sample of methane gas, CH4?

12. What is the molar mass of an unknown sample of gas with a density of 2.43 g/L?

Percent Composition13. What is the percent composition of chlorine in NH4Cl?

14. What is the percent composition of sodium in NaOH?

Empirical and Molecular Formulas15. What is an empirical formula and what is a molecular formula?

16. What is the molecular formula for each compound? Each compound’s empirical formula and molar mass is given.

a. CH2O, 90 g/mol

b. HgCl, 472.2 g/mol

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