Question

The equilibrium constant, Kc, for the formation of nitrosyl chloride from nitric oxide and chlorine. 2NO(g)...

The equilibrium constant, Kc, for the formation of nitrosyl chloride from nitric oxide and chlorine.

2NO(g) + Cl2(g) ⇌ 2NOCl(g)

is 6.5 ×104 at 35°C. In which direction will the reaction proceed to reach equilibrium if the starting concentrations of NO, Cl2, and NOCl are 5.2 × 10−3M, 3.4 × 10−4M, and 3.4 M respectively?

Homework Answers

Answer #1

SOLUTION

We have the equillibrium reaction

2NO(g) + Cl2(g) ⇌ 2NOCl(g) Kc =  6.5 ×104 at 35°C

initial concentration    5.2 × 10−3M 3.4 × 10−4M    3.4 M

If the reaction quotient Q > Kc , then the reaction will move in backward direction

If the reaction quotient Q < Kc , then the reaction will move in forward direction

If the reaction quotient Q = Kc , then the reaction is in equillibrium

Calculating Q = [NOCl]2 / [Cl2] [NO]2 = [3.4 M]2 / [ 3.4 × 10−4M ] [5.2 × 10−3M ]2 = 1.26 * 109

So, the reaction quotient Q > Kc , then the reaction will move in backward direction Answer

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