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1 What is the mass of potassium chloride when 6.75 g of potassium reacts with an excess of chlorine gas? The balanced chemical equation is: 2K + Cl2 → 2KCl 6.45 g 25.7 g c g d g Students type their answers here
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2 The table shows the mole ratios of potassium and bromine combined to form potassium bromide according to the balanced reaction. In which trial(s) is bromine the limiting reagent? 2K + Br KBr Trials 1 and 3 Trial 2 only c. Trials 2 and 3 d. Trial 1 only Trial Moles of K Moles of Br 1 10 3 2 14 8 Students type their answers here
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3 Which is the correct number of moles of NO that is produced from 13.2 moles of oxygen gas in the presence of excess ammonia? 4 NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (l) 10.6 moles 12.2 moles c moles d moles Students type their answers here
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4 A certain reaction has a 73.6% yield. If 53.8 grams of the product were predicted by stoichiometry to be made, what would the actual yield be? 73.1 g 19.8 g c g d g Students type their answers here
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5 How many moles of Cu are needed to react with 5.8 moles of AgNO3? Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag 2.9 moles 3.8 moles c. 5.8 moles d moles Students type their answers here
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6 How many grams of O2 are required to produce grams of ZnO? 2Zn + O2 → 2ZnO 1302 g 14.5 g c g d g Students type their answers here
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7 How many grams of H2O will be produced if 750 grams of Fe are produced? Fe3O4 + H2 → Fe + H2O 17.9 g 322 g c. 563 g d. 241 g Students type their answers here
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Which is the number of moles of carbon dioxide produced from the complete combustion of 5.42 moles of ethanol? C2H6O + O2 → CO2 + H2O 5.42 moles 2.71 moles c moles d moles 8 Students type their answers here
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9 Find the mole ratio of potassium to potassium bromide in this chemical reaction. K + Br2 → KBr Students type their answers here
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10 How many moles of potassium bromide can be produced from 15.3 moles of bromine? K + Br2 → KBr Students type their answers here
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11 This reaction between ethyne and hydrogen gas yields ethane. Which is the limiting reactant? C2H2 + H2 → C2H6 2 mol mol Students type their answers here
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12 In a reaction, 23 g of solid phosphorus (P4) reacts with 16 g of chlorine gas to form phosphorus pentachloride. Calculate the mass of phosphorus pentachloride produced. Students type their answers here
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13 Upon heating, 235 g of calcium carbonate (CaCO3) decomposes to calcium oxide (CaO) and carbon dioxide (CO2). What is the percent yield of CO2 if 97.5 g of CO2 is collected? Students type their answers here
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