2. 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%

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

4. Balance the following equation (find what number coefficient X is): NH_{3 (g)} + O_{2 (g)} --> NO _(g) + XH₂O _(g).
2 3 4 5 6

5. When aluminum reacts with sulfuric acid, the result is aluminum sulfate and hydrogen gas. How many moles of sulfuric acid (H₂SO₄) will react with 24 moles of aluminum?
12 14 16 18 20

6. 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

7. 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

8. 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

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

10. 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%

11. 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

12. 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

13. 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

14. The empirical formula of a compound is C₁₀H₂₀ with a molar mass of 284 grams, find the molecular weight.
C₂₀H₄₀ C₁₀H₂₀ C₅H₁₀ C₄H₈ CH₄

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

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