# 5_new - Homework#4 holcombe(51160 This print-out should...

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Homework #4 – holcombe – (51160) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Suppose the reaction H 2 (g) + I 2 (g) 2 HI(g) has an equilibrium constant K C = 49 and the initial concentration of H 2 and I 2 is 0.60 M and HI is 0.0 M. Which of the following is the correct value for the final concentration of HI(g)? 1. 0.467 M 2. 0.933 M correct 3. 0.219 M 4. 1.050 M 5. 0.250 M 6. 0.778 M 7. 0.525 M Explanation: K c = 49 [H 2 ] ini = 0 . 60 M [I 2 ] ini = 0 . 60 M [HI] ini = 0 M H 2 (g) + I 2 (g) 2 HI(g) Ini, M 0.6 0.6 0 Δ, M −x −x +2 x Equil, M 0 . 6 x 0 . 6 x 2 x [HI] 2 K c = [H 2 ] [I 2 ] (2 x ) 2 49 = (0 . 6 x ) 2 2 x 7 = 0 . 6 − x 7(0 . 6 x ) = 2 x 4 . 2 7 x = 2 x 4 . 2 = 9 x x = 4 9 . 2 = 0 . 46667 M Looking back at our equilibrium values, we see that the final concentration of HI is equal to 2 x , so 2(0.46667 M) = 0.933 M. 002 10.0 points For the reaction 4 NH 3 (g) + 3 O 2 (g) 2 N 2 (g) + 6 H 2 O(g) , K = 10 80 at a certain temperature. Initially, all reactants and products have concentra- tions equal to 12 M. What is the approximate concentration of ammonia at equilibrium? 1. 18 M 2. 6 M 3. 12 M 4. 0 M correct 5. 3 M Explanation: 003 10.0 points The equilibrium constant for the reaction HNO 2 (aq) + H 2 O( ) NO 2 (aq) + H 3 O + (aq) is 4 . 3 × 10 −4 at 25 C. Will nitrous acid spontaneously dissociate when [HNO 2 (aq)] = [NO 2 (aq)] = [H 3 O + (aq)] = 1.0 M? 1. No correct 2. Unable to determine 3. Yes Explanation: 4 10.0 points A reaction between gaseous sulfur dioxide and oxygen gas to produce gaseous sulfur trioxide takes place at 600 C. At that temperature, the concentration of SO 2 is found to be 1.51

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Homework #4 – holcombe – (51160) 2 mol/L, the concentration of O 2 is 1.01 mol/L, and the concentration of SO 3 is 3.30 mol/L. Using the balanced chemical equation, find the equilibrium constant for this system. Correct answer:
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5_new - Homework#4 holcombe(51160 This print-out should...

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