10462ndspring2011f2

10462ndspring2011f2 - GeneralChemistryI exam2 Form 2...

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General Chemistry I exam 2 10/20/2011 R. Lopez de la Vega Name_____________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is Δ n for the following equation in relating K c to K p ? N 2 O 4 (g) 2NO 2 (g) A) 3 B) - 1 C) 2 D) 1 E) - 2 1) 2) The reaction below has a K p value of 3.3 x 10 - 5 . What is the value of K c for this reaction at 700 K? 2 SO 3 (g) 2 SO 2 (g) + O 2 (g) A) 1.7 × 10 6 B) 3.3 × 10 - 5 C) 5.7 × 10 - 7 D) 1.9 × 10 - 3 E) 3.0 × 10 4 2) 3) Calculate the pH of a solution that contains 2.4 × 10 - 5 M H 3 O at 25°C. A) 2.40 B) 11.60 C) 9.38 D) 4.62 E) 4.17 3) 4) Determine the value of K c for the following reaction if the equilibrium concentrations are as follows: [PCl 5 ] eq = 0.56 M, [PCl 3 ] eq = 0.23 M, [Cl 2 ] eq = 4.4 M. PCl 5 (g) PCl 3 (g) + Cl 2 (g) A) 0.93 B) 1.8 C) 1.1 D) 0.55 E) 0.76 4) 5) Determine the [OH ] concentration in a 0.169 M Ca(OH) 2 solution. A) 0.338 M B) 5.92 × 10 - 14 M C) 0.298 M D) 2.96 × 10 - 14 M E) 0.169 M 5) 6) Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of CO. CO(g) + 2 H 2 (g) CH 3 OH(l) K p = 2.25 × 10 4 P(H 2 ) eq = 0.52 atm A) 8.5 x 10 - 5 atm B) 6.25 x 10 - 3 atm C) 8.3 x 10 4 atm D) 1.2 x 10 - 5 atm E) 1.6 x 10 - 4 atm 6) B 1
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7) Consider the following reaction at equilibrium. What effect will increasing the temperature have on the system? Fe 3 O 4 (s) + CO(g) 3 FeO(s) + CO 2 (g) Δ = +35.9 kJ A) The reaction will shift to the right in the direction of products. B) No effect will be observed. C) The equilibrium constant will increase. D) The equilibrium constant will decrease. E) The reaction will shift to the left in the direction of reactants. 7) 8) Determine the pH of a 0.461 M C 6 H 5 CO 2 H M solution if the K a of C 6 H 5 CO 2 H is 6.5 x 10 - 5 .
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10462ndspring2011f2 - GeneralChemistryI exam2 Form 2...

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