The reaction: 2 NOg + Cl2g = 2 NOClg has been studied and found to be second ord

Question

The reaction:     2 NOg + Cl2g = 2 NOClg has been studied and found to be second order with respect to nitrogen monoxide and first order with respect to chlorine.

a. What is the overall order for the reaction?

b. How does the reaction rate change when the nitrogen monoxide concentration is halved and the chlorine concentration is doubled? Define terms (e.g., [NO]1 for initial concentration in experiment 1, [NO]2 for initial concentration in experiment 2, [NO]2 = 12 [NO]1), set up the rate law ratios and show cancellations for Exp2/Exp1 .

Explanation / Answer

(a) Over all order of reaction = 2 + 1 = 3

(b) Rate law expression, r = k[NO]2[Cl2]

r1 = k[x]2[y]

r2 = k (x/2)2(2y)

r2/r1 = (1/2)

The rate of reaction is halved.

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