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Study the reaction.

NH4+ + NO2– ⟶ N2 + 2H2O

The rate of this reaction is proportional to the concentration of ammonium (NH4+) and the concentration of nitrogen dioxide (NO2–).

What is the rate law of this reaction?

Rate = K[N2][H2O]2
Rate = K[NH4+]2
Rate = K[NH4+][NO2–]
Rate = K[NO2–]2

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Answer:

Rate = K[NH4+][NO2–]

Explanation:

Hello there!

In this case, since rate laws include the concentration of the species contributing to the rate of a chemical reaction; this question asserts this reaction is proportional to the concentration of ammonium (NH4+) and the concentration of nitrogen dioxide (NO2–); therefore, the rate law must contain the concentration of both reactants, for that reason, the answer would be Rate = K[NH4+][NO2–] as it contains the concentration of the aforementioned species.

Regards!

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