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1. What is the mass percent of oxygen in H2SO4 (sulfuric acid)?
0 1% 2.04% 32.70% 65.26%

2. Balance the following equation (find what number coefficient X is): NH3 (g) + O2 (g) --> NO (g) + XH2O (g).
2 3 4 5 6

3. How many carbon molecules are present in 5.0 grams of glucose? (C6H12O6)
1.0 * 10^22 5.1 * 10^22 1.0 * 10^23 6 None

4. The formation of ammonia is shown by the following reaction: N2 (g) + 3H2 (g)--> 2NH3 (g). You are given 13.85 grams of nitrogen and 5.27 grams of hydrogen. If the experiment produced 3.297 grams of ammonia, then what is the percent yield?
25% 50% 35.80% 76.60% None of these

5. On a faraway planet, the following system of measurement is used: 1 zorg = 5.81 zaks 1 zak = .87 zips 1 zip = 2.52 zeeks 1 zeek = 10.02 yaks 1 yak = 3.91 zaps How many zorgs are in 3.20 zaps?
5.81 12.53 2.74 0.00641 None of these

6. Ferric chloride can be made by the reaction of iron with chlorine gas. How much mass, in grams, is needed to completely react with 24.0 g chlorine gas?
12.59 24.0 48.0 12.6 48.01

7. Hydrogen gas and oxygen gas can form water. What mass of water will form from excess oxygen and 24.0 g H2? (Assume a complete reaction)
107 216 24.0 48.0 96.0

8. 6.02x1023 is....
a random number Avogadro's number stoichiometry percent yield None of these

9. The combustion of butane (C4H10 with oxygen gas will yield carbon dioxide and water. Calculate the % yield of CO2 when 42 grams of butane are burned with 16.0 grams of oxygen and 10. grams of CO2 was formed.
25% 100% 32% 74% 64%

10. How many kilometers are in 10.00 miles? (1 inch equals exactly 2.54 centimeters)
2.04 km 4.09 km 8.09 km 16.09 km None of these

11. If 11 grams in a reaction was obtained, and you had a theoretical yield of 14 grams, what is your % yield?
0.79% 79% 11% 14% 12%

12. How many moles in 20 g of water?
1.11 20 18 1.1 42

13. When 2 moles of propane (C3H8, MW = 44 grams) is combusted with oxygen gas, how many grams of CO2 (MW: 44 grams) are produced?
88 44 3 132 264

14. How many grams is 0.25 moles of table salt (NaCl?)
58.44 grams 14.61 grams 14.6 grams 58 grams 15 grams

15. Hydrochloric acid reacts with calcium carbonate yielding calcium chloride, water, and carbon dioxide. How many moles of calcium carbonate would be necessary to react with 8 moles of HCl?
1 2 3 4 5

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