1. Molar Mass & Stoichiometry

2. What is the Molar Mass of Mg(OH) 2 ? 1. 41.32 g/mole 2. 42.33 g/mole 3. 58.33 g/mole 4. 827.03 g/mole 5. Not listed 1234567891011121314151617181920 21222324252627282930

3. What is the Molar Mass of H 3 PO 4 ? 1. 47.98 g/mole 2. 95.96 g/mole 3. 98.00 g/mole 4. 196.00 g/mole 5. Not listed 1234567891011121314151617181920 21222324252627282930

4. Convert 125.25 g of Sulfur (S 8 ) (MM = 256.56 g) to moles. 1. 0.48819 moles 2. 3.9055 moles 3. 4.4588 moles 4. 157.32 moles 5. 4016.8 moles 6. Not listed 1234567891011121314151617181920 21222324252627282930

5. Convert 3.75 moles of BaSO 4 to grams. (MM = 233.4 g) 1. 875 g 2. 233.40 g 3. 62.2 g 4. 0.0161 g 5. Not listed 1234567891011121314151617181920 21222324252627282930

6. Convert 2.50 moles of KCl (MM = 74.55 g) to molecules. 1. 4.15 x 10 -24 molecules 2. 1.51 x 10 24 molecules 3. 6.02 x 10 23 molecules 4. 6.78 x 10 25 molecules 5. Not listed 1234567891011121314151617181920 21222324252627282930

7. Convert 70.0 g of LiBr (MM = 86.84 g) to molecules. 1. 7.47 x 10 23 molecules 2. 4.21 x 10 25 molecules 3. 3.65 x 10 27 molecules 4. 4.85 x 10 23 molecules 5. Not listed 1234567891011121314151617181920 21222324252627282930

8. Stoichiometry Mole Ratios

9. Given the reaction 2 PbS + 3 O 2  2 PbO + 2 SO 2 239.27 32.00 223.20 64.07 g/mole 25.00 g of O 2 will yield how many grams of PbO? 1. 261.6 grams 2. 116.3 grams 3. 174.4 grams 4. 223.2 grams 5. 186.9 grams 6. Not listed 1234567891011121314151617181920 21222324252627282930

10. Given the reaction 4 Al + 3 O 2  2 Al 2 O 3 26.98 32.00101.96 g/mole 4.5 moles of Al will yield how many grams of Al 2 O 3 ? 1. 920 grams 2. 6200 grams 3. 460 grams 4. 61 grams 5. 230 grams 6. Not listed 1234567891011121314151617181920 21222324252627282930

11. Given the reaction 2 C 6 H 14 + 19 O 2  12 CO 2 + 14 H 2 O 86.20 32.00 44.01 18.02 g/mole 140.85 grams of C 6 H 14 will yield how many molecules of H 2 O? 1. 5.9354 x 10 26 molecules 2. 8.4792 x 10 25 molecules 3. 1.2113 x 10 25 molecules 4. 6.8856 x 10 24 molecules 5. 2.8812 x 10 -21 molecules 6. Not listed 1234567891011121314151617181920 21222324252627282930

12. Percent Composition, Empirical Formulas Molecular Formulas

13. What is the % mass of lead in PbO 2 ? 1. 86.62% 2. 92.83% 3. 13.37% 4. 6.69% 5. 13.37% 6. Not listed 1234567891011121314151617181920 21222324252627282930

14. What is the % mass of Cu in Cu 2 S? 1. 66.46% 2. 39.93% 3. 79.85% 4. 20.14% 5. 33.54% 6. Not listed 1234567891011121314151617181920 21222324252627282930

15. What is the % mass of nitrogen in Ba(NO 3 ) 2 ? 1. 5.36% 2. 10.72% 3. 16.08% 4. 47.45% 5. 23.73% 6. Not listed 1234567891011121314151617181920 21222324252627282930

16. What is the mass of oxygen in 54 g of H 2 O. 1. 48 g 2. 16 g 3. 6.0 g 4. 3.0 g 5. Not listed 1234567891011121314151617181920 21222324252627282930

17. A compound is found to contain 53.70% iron and 46.30% sulfur. What is the empirical formula of this compound? 1. FeS 2. FeS 2 3. Fe 2 S 3 4. Fe 3 S 2 5. Not listed 1234567891011121314151617181920 21222324252627282930

18. A compound contains 4.04 g of N and 11.46 g of O. What is the compound’s empirical formula? 1. NO 2. N 2 O 7 3. N 5 O 2 4. N 2 O 5 5. Not listed 1234567891011121314151617181920 21222324252627282930

19. The molar mass of a compound is 283.89 g/mol. If the empirical formula is P 2 O 5, what is its molecular formula? 1. P 4 O 10 2. P 4 O 5 3. P 10 O 50 4. P 2 O 5 5. Not listed 1234567891011121314151617181920 21222324252627282930