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sp2010ex2f3 (1) - GeneralChemistryII C1 Name...

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Examination III General Chemistry II Dr. Lopez de la Vega C 1 11/17/2009 Name _______________________________ Choose the best answer from the ones provided MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Determine the theoretical yield and the percent yield if 21.8 g of K 2 CO 3 is produced from reacting 27.9 g KO 2 with 29.0 L of CO 2 (at STP). The molar mass of KO 2 = 71.10 g/mol and K 2 CO 3 = 138.21 g/mol. 4 KO 2 (s) + 2 CO 2 (g) 2 K 2 CO 3 (s) + 3 O 2 (g) A) 91.7 g, 23.8 % yield B) 27.1 g, 80.4 % yield C) 206 g, 10.6 % yield D) 61.0 g, 35.7 % yield E) 179 g, 12.2 % yield 1) 2) Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N 2 O 4 and 45.0 g N 2 H 4 . Some possibly useful molar masses are as follows: N 2 O 4 = 92.02 g/mol, N 2 H 4 = 32.05 g/mol. N 2 O 4 (l) + 2 N 2 H 4 (l) 3 N 2 (g) + 4 H 2 O(g) A) LR = N 2 O 4 , 45.7 g N 2 formed B) LR = N 2 O 4 , 105 g N 2 formed C) LR = N 2 H 4 , 59.0 g N 2 formed D) No LR, 45.0 g N 2 formed E) LR = N 2 H 4 , 13.3 g N 2 formed 2) 3) Which of the following statements is TRUE? 3)
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