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RelativeResourceManager2 - CHEM 6B PRACTICE EXAM 3-1 (Prof....

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Chem 6B Practice Exam 3-1 1 Prof. Crowell CHEM 6B PRACTICE EXAM 3-1 (Prof. Crowell) Spr 2010 May 17, 2010 *** FILL IN YOUR STUDENT ID NUMBER , NAME , and TEST FORM = A *** Bubble in the correct response on scantron (25 questions, worth 4 pts each) 1. Consider the following reaction: 4 NH 3 (g) + 5 O 2 (g) 4 NO (g) + 6 H 2 O (g); A mixture, initially consisting of 7.2 torr of NH 3 (g) and 6.4 torr of O 2 (g), reacts at a certain temper- ature. At equilibrium, the partial pressure of H 2 O (g) is 2.4 torr. Calculate the partial pressure of O 2 (g) at equilibrium. a) 4.4 torr b) 5.6 torr c) 3.4 torr d) 0.4 torr e) 1.6 torr 2. What is the pH of a 3.2 M solution of H 3 PO 4 at 298K? ( K a1 = 7.2 x 10 -3 , K a2 = 6.3 x 10 -8 , K a3 = 4.2 x 10 -13 ) a) pH = 3.35 b) pH = 1.07 c) pH = 0.82 d) pH = 1.41 e) pH = 1.64 3. At 700 C, K p = 0.55 for the reaction 4 NO (g) + 6 H 2 O (g) 4 NH 3 (g) + 5 O 2 (g). What is the value of K c at 700 C? a) 6.8 x 10 3 b) 44.5 c) 4.4 x 10 3 d) 32.0 e) 31.6
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Chem 6B Practice Exam 3-1 2 Prof. Crowell 4. Shortly after mixing NO 2 (g) and N 2 O 4 (g), the partial pressures of NO 2 and N 2 O 4 were found to be 0.5 bar and 0.2 bar respectively. The value of K p for the reaction 2 NO 2 (g) N 2 O 4 (g) is 0.8. What is the value of the reaction quotient, Q, and in which direction does the reaction proceed from this point? a) 0.08, right b) 2.5, left c) 0.4, right d) 0.2, right e) 0.8, at equilibrium 5. Consider the following reaction at equilibrium: 4 NH 3 (g) + 5 O 2 (g) 4 NO (g) + 6 H 2 O (g); H = 44 kJ The amount of NH 3 (g) present can be maximized by carrying out the reaction at: a) high temperature and low pressure (large volume) b) high temperature and high pressure (reduced volume) c) low temperature and low pressure (large volume) d) low temperature and high pressure (reduced volume)
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RelativeResourceManager2 - CHEM 6B PRACTICE EXAM 3-1 (Prof....

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