Consider the reaction: 2NO (g) + 2H2 (g) → N2 (g) + 2H2O (g) A suggested mechanism for this reaction follows: (1) NO (g) + NO (g) → N2O4 (g) (slow) (2) N2O4 (g) + H2 (g) → N2 (g) + H2O2 (g) (fast) (3) H2O2 (g) + H2 (g) → 2H2O (g) (fast) Based on this mechanism, which, if any, of the following actions will not affect the rate of the reaction?

Question

Chemistry

Brooke Delacruz

19 June, 13:28

Consider the reaction: 2NO (g) + 2H2 (g) → N2 (g) + 2H2O (g) A suggested mechanism for this reaction follows: (1) NO (g) + NO (g) → N2O4 (g) (slow) (2) N2O4 (g) + H2 (g) → N2 (g) + H2O2 (g) (fast) (3) H2O2 (g) + H2 (g) → 2H2O (g) (fast) Based on this mechanism, which, if any, of the following actions will not affect the rate of the reaction?

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Answers (1)

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Lennon Chen · Answer 1

Hello. This question is incomplete. The full question is:

"Consider the following reaction. 2NO (g) + 2H2 (g) → N2 (g) + 2H2O (g)

A proposed reaction mechanism is: NO (g) + NO (g) N2O2 (g) fast N2O2 (g) + H2 (g) → N2O (g) + H2O (g) slow N2O (g) + H2 (g) → N2 (g) + H2O (g) fast

What is the rate expression? A. rate = k[H2] [NO]2 B. rate = k[N2O2] [H2] C. rate = k[NO]2 [H2]2 D. rate = k[NO]2 [N2O2]2 [H2]"

Answer:

A. rate = k[H2] [NO]2

Explanation:

A reaction mechanism is a term used to describe a set of phases that make up a chemical reaction. In these phases a detailed sequence of each step is shown, composed of several complementary reactions, which occur during a chemical reaction.

These mechanisms are directly related to chemical kinetics and allow changes in reaction rates to be observed in advance.

Reaction rate, on the other hand, refers to the speed at which chemical reactions occur.

Based on this, we can observe through the reaction mechanism shown in the question above, that the action "k [H2] [NO] 2" would have no changes in the reaction rate.