2. 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

3. 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

4. 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

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

6. 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%

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. A chemistry student was performing an experiment involving the following reaction: C₃H₈ (g) + O₂ (g) --> CO₂ (g) + H₂O (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
C₃H₈'s coefficient should be 3, not 1 CO₂'s coefficient should be 3, not 2 O₂'s coefficient should be 3, not 5 Water's coefficient should be 3, not 4 None of these

9. 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

10. 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%

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

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

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

14. 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

15. 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

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