2. What is the % mass of carbon in carbon dioxide? 44% 25% 27% 63% 50%

3. Substance X has a mass of 36.08 grams. Calculations show that .199 moles of substance X exist. What element is most likely X? Molybdenum Technetium Ruthenium Rhodium Palladium

4. When 2 moles of propane (C_{3}H_{8}, MW = 44 grams) is combusted with oxygen gas, how many grams of CO_{2} (MW: 44 grams) are produced? 88 44 3 132 264

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. Hydrogen gas and oxygen gas can form water. What mass of water will form from excess oxygen and 24.0 g H_{2}? (Assume a complete reaction) 107 216 24.0 48.0 96.0

7. Balance the following equation (find what number coefficient X is): NH_{3 (g)} + O_{2 (g)} --> NO _{(g)} + XH_{2}O _{(g)}. 2 3 4 5 6

8. When aluminum reacts with sulfuric acid, the result is aluminum sulfate and hydrogen gas. How many moles of sulfuric acid (H_{2}SO_{4}) will react with 24 moles of aluminum? 12 14 16 18 20

9. The formation of ammonia is shown by the following reaction: N_{2 (g)} + 3H_{2 (g)}--> 2NH_{3 (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

10. There are two beakers sitting on a table. One contains 56.20 grams of water. The other contains hydrochloric acid (HCl). The number of atoms of hydrogen in the HCl equals the number of total atoms in the beaker full of water. How many grams of HCl are in the second beaker? 341.4 grams 142.4 g 938.1 g 53.29 g None of these

11. A chemistry student was performing an experiment involving the following reaction: C_{3}H_{8} (g) + O_{2} (g) --> CO_{2} (g) + H_{2}O (g), balancing it with the coefficients 1, 5, 2, and 4 respectively. The oxygen was in excess. He used 20.18 grams of C3H8. When he measured the amount of CO2 produced, he was astounded to find that 46.22 grams were produced, 5.88 grams more than the theoretical yield of 40.34. What went wrong? Hint: Look at the formula C_{3}H_{8}'s coefficient should be 3, not 1 CO_{2}'s coefficient should be 3, not 2 O_{2}'s coefficient should be 3, not 5 Water's coefficient should be 3, not 4 None of these

12. 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

13. What is the mass percent of oxygen in H_{2}SO_{4} (sulfuric acid)? 0 1% 2.04% 32.70% 65.26%

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. The combustion of butane (C_{4}H_{10} with oxygen gas will yield carbon dioxide and water. Calculate the % yield of CO_{2} when 42 grams of butane are burned with 16.0 grams of oxygen and 10. grams of CO_{2} was formed. 25% 100% 32% 74% 64%

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