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practice14

# practice14 - CHM1046 Examination1 Fall2010 Name...

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CHM 1046 9/23/2010 Examination 1 - Fall 2010 Form R. Lopez de la Vega Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The equilibrium equation is also known as the law of A) constant concentration. B) mass action. C) coefficients. D) dynamic equilibrium. 1) 2) Which of the following statements is false regarding the equilibrium constant, K c ? A) K c for the reverse reaction is the negative of K c for the forward reaction. B) K c for a reaction at a particular temperature always has the same value. C) The numerical value of K c depends on the form of the balanced equation. D) When quoting K c it is customary to omit units. 2) 3) The oxidation of sulfur dioxide by oxygen to sulfur trioxide has been implicated as an important step in the formation of acid rain: 2 SO 2 ( g ) + O 2 ( g ) 2 SO 3 ( g ). If the equilibrium partial pressures of SO 2 , O 2 , and SO 3 are 0.564 atm, 0.102 atm, and 0.333 atm respectively at 1000 K, what is K p at that temperature? A) 5.79 B) 8.11 C) 0.292 D) 3.42 3) 4) The decomposition of ammonia is: 2 NH 3 ( g ) = N 2 ( g ) + 3 H 2 ( g ). If K p is 1.5 × 10 3 at 400°C, what is the partial pressure of ammonia at equilibrium when N 2 is 0.10 atm and H 2 is 0.15 atm? A) 4.4 × 10 6 atm B) 2.1 × 10 3 atm C) 2.2 × 10 - 7 atm D) 4.7 × 10 - 4 atm 4) 5) Given the reaction: 2 HI H 2 + I 2 . If K c ʹ for the reverse reaction is 1.85 × 10 - 2 at 425°C, what is K c for the forward reaction at the same temperature? A) 3.70 × 10 - 2 B) 1.85 × 10 - 2 C) 54.1 D) - 1.85 × 10 - 2 5) 6) Which one of the following statements about the equilibrium constant, K p , is false ? A) The units for K p are usually omitted. B) Total pressures are used in the equilibrium equation in place of molar concentrations. C) The relationship between K p and K c is: K p = K c ( RT ) Δ n D) Δ n is equal to the sum of the coefficients of the gaseous productsminus the sum of the coefficients of the gaseous reactants.

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practice14 - CHM1046 Examination1 Fall2010 Name...

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