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If we write rate of reaction in terms of concentration of NH3 and H2, then Rate of reaction = 1/2 d[NH3]/dt = -1/3 d[H2]/dt

1. Rate of reaction = 1/2 d[NH3]/dt = -1/3 d[H2]/dt
2. d[NH3]/dt = 2/3 d[H2]/dt
3. Rate of reaction is proportional to NH3.
4. Rate of reaction is proportional to H2.

Correct answer: Rate of reaction = 1/2 d[NH3]/dt = -1/3 d[H2]/dt

Solution

The given equation correctly represents the relationship between the rate of reaction and the stoichiometric coefficients of NH3 and H2. The rate is inversely proportional to their respective coefficients in the balanced chemical equation.

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