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1. 6.02x1023 is....
a random number Avogadro's number stoichiometry percent yield None of these

2. 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

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

4. 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%

5. 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

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

7. There are 2.34 moles of substance A3 combined with 2.77 moles of substance B. Assume that the reaction goes to completion. After the reaction is complete, AB is reacted with substance C2. The reaction creates CB and A. If C2 was in excess during the second reaction, then how many moles of CB were produced?
2.43 moles 3.82 moles 4.38 moles 7.02 moles None of these

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

9. 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

10. Substance A combines with substance B to form Substance AB. B is a diatomic molecule. You are given 3.15 moles of B2. If A is in excess, how many moles of AB are produced?
1.20 2.30 3.25 5.60 6.30

11. 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

12. 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

13. 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

14. 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

15. 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

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