Spring 2007 EXAM 2B - Exam2 Name_Section MULTIPLECHOICE. 1...

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Exam 2 Name___________________________________ Section __________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Given the data in the table below, Δ rxn for the reaction 4NH 3 (g) + 5O 2 (g) 4NO (g) + 6H 2 O (l) is __________ kJ. Substance Δ H f ° (kJ/mol) H 2 O (l) - 286 NO (g) 90 NO 2 (g) 34 HNO 3 (aq) - 207 NH 3 (g) - 46 A) - 1892 B) - 1172 C) - 1540 D) - 150 E) The Δ H f ° of O 2 (g) is needed for the calculation. 1) 2) A weak electrolyte exists predominantly as __________ in solution. 2)
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