1. 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 2. 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 3. 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 4. 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 5. 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 6. 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 7. 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 8. What is the % mass of carbon in carbon dioxide? 44% 25% 27% 63% 50% 9. How many grams is 0.25 moles of table salt (NaCl?) 58.44 grams 14.61 grams 14.6 grams 58 grams 15 grams 10. 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 11. 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 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. Balance the following equation (find what number coefficient X is): NH3 (g) + O2 (g) --> NO (g) + XH2O (g). 2 3 4 5 6 14. 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 15. 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 Name: E-mail: Last 15 Challengers
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