chm 2046 quiz 1 - CHM2046 Prof C.R Martin NAME Quiz 1 Jan...

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3H 2 (g) 2NH 3 (g) N 2 (g) + CHM2046 – Prof. C.R. Martin Quiz 1 Jan. 25, 2008 NAME: __________________________ Section #:_______________ ! SHOW ALL WORK ! 1. Write the equilibrium constant expression (K c ) for each of the following reactions: a.) ) ( ) ( 2 ) ( ) ( 2 2 2 g Cl g HBr l Br g HCl + + 10 pts b.) ) ( 2 ) ( 4 ) ( 2 ) ( 6 3 2 2 g NO g HNO g O H g NO + + 10 pts 2. At 700 o C, K c = 9.30 x 10 -8 for the reaction 2H 2 S(g) ↔ 2H 2 (g) + S 2 (g) 0.0020 moles of each component are added to a 1.0 L flask. Which of the following statements is true? (Show all work!) (10 pts ) a. The reaction is at equilibrium. b. The reaction is not at equilibrium and in achieving equilibrium more products are created. c. The reaction is not at equilibrium and in achieving equilibrium more reactant is created. = 0.002 M , Similarly for [H 2 ] and [S 2 ] = 0.0020 M = Since Q c > K c , the system is not at equilibrium, and in order to reestablish equilibrium is has to shift to the left, and thus more reactants will need to be created. 3. At 25 ° C, K c = 3.5 x 10 8 for the reaction Find K p . (R = 0.082 L . Atm . mol -1. K -1 ) (20pts ) K p = K c (RT) n K p = 3.5 × 10 8 (0.082 × 298) -2 = 5.86 × 10 5 n gas = 2 – (3+1) = -2
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