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# Chap 17 practice problems answers - EXAM PRACTICE QUESTIONS...

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Chapter 17 1. Write the equilibrium constant expression for the following reaction. Answer: K c = [NO] 4 [H 2 O] 6 [NH 3 ] 4 [O 2 ] 5 2. Some nitrogen and hydrogen gases are pumped into an empty 5.00-L vessel at 500 ° C. When equilibrium was established, 3.00 moles of N 2 , 2.10 moles of H 2 , and 0.298 moles of NH 3 were present. Evaluate K c at 500 ° C. Answer: K c = 0.080 3. The equilibrium constant, K c , for the following reaction is 0.0154 at a high temperature. A mixture in a container at this temperature has the concentrations: [H 2 ] = 1.11 M, [I 2 ] = 1.30 M and [HI] = 0.181 M. Will more product or more reactant be formed, or is the reaction at equilibrium? Answer: Q = 0.227 > K c , shifts left, reactants are produced 4. K c = 0.040 for the system below at 450 ° C. If a reaction is initiated with 0.20 mole of Cl 2 , and 0.20 mole of PCl 3 in a 1.0-L container, what concentration of PCl 5 will be present at equilibrium? Answer:

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Chap 17 practice problems answers - EXAM PRACTICE QUESTIONS...

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