Chemistry Test Review Sheet – Chapters 10 & 11



Chapter 10 – Moles Study Guide

****ALL ANSWERS MUST INCLUDE THE PROPER UNITS & SIG FIGS!****

SOLVE THE FOLLOWING MOLAR CONVERSION PROBLEMS:

1. How many grams would 8.1 ( 1021 molecules of sucrose (C12H22O11) weigh?

2. How many grams of AgNO3 are required to make 2.50 moles?

3. How many moles are in 53.8 g of magnesium chloride?

4. How many formula units (particles) are in 0.845 moles of NaNO3?

5. How many grams of aluminum chloride are required to make 0.50 moles?

6. How many molecules are in 50.0 g of carbon disulfide?

7. Find the number of formula units (particles) of 2.6 g of ZnCl2.

8. How many atoms are in a 2.0 kg brick of gold? (Note mass units!)

9. Determine the mass in grams of 5.00 moles of oxygen gas.

10. How many atoms are present in 8.00 moles of antimony atoms?

SOLVE THE FOLLOWING PERCENTAGE COMPOSITION PROBLEMS:

11. Find the percentage composition of sucrose (C12H22O11).

12. Find the percentage composition of a sample containing 1.29 g of carbon and 1.71 g of oxygen.

13. How many grams of zinc are in a 37.2-gram sample of zinc nitrate?

SOLVE THE FOLLOWING EMPIRICAL & MOLECULAR FORMULA PROBLEMS:

14. Find the empirical formula of a compound that contains 9.03 g magnesium and 3.48 g of nitrogen.

15. What is the empirical formula for a compound that is 43.6% phosphorus and 56.4% oxygen?

16. The empirical formula of a compound is NO2. Its molar mass is 92 g/mol. What is its molecular formula?

17. A compound is composed of 34.2% sodium, 17.7% carbon, and 47.6% oxygen. Find its empirical formula. If its molar mass is 134 g/mol, find its molecular formula.

SOLVE THE FOLLOWING HYDRATE PROBLEMS:

18. Name these hydrates:

a. CaCl2 ( 2H2O

b. FeCl3 ( 6H2O

19. What is the percent composition of water for the compound in 18b?

20. A sample of copper (II) sulfate hydrate has a mass of 3.97 g. After heating, the CuSO4 that remains has a mass of 2.54 grams. Determine the correct formula and name of the hydrate.

Chapter 10 Moles Study Guide

ANSWER KEY

***ALL ANSWERS MUST INCLUDE THE PROPER UNITS & SIG FIGS.***

1. 4.6 g C12H22O11

2. 425 g AgNO3

3. 0.565 mol MgCl2

4. 5.09 × 1023 formula units NaNO3

5. 67 g AlCl3

6. 3.95 × 1023 molec. CS2

7. 1.1 × 1022 units ZnCl2

8. 6.1 × 1024 atoms Au

9. 160. g O2

10. 4.82 × 1024 atoms Sb

11. 42.10% C, 6.49% H, 51.41% O

12. 43% C, 57% O

13. 12.8 g zinc

14. Mg3N2

15. P2O5

16. N2O4

17. empirical: NaCO2 molecular: Na2C2O4

18. a. calcium chloride dihydrate b. iron (III) chloride hexahydrate

19. 39.99% H2O

20. CuSO4 ( 5H2O copper (II) sulfate pentahydrate

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