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For the chemical reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the correct option is:

1. -1/3 d[H₂]/dt = -1/2 d[NH₃]/dt
2. -d[N₂]/dt = 2 d[NH₃]/dt
3. -d[N₂]/dt = -1/2 d[NH₃]/dt
4. d[H₂]/dt = 2 d[NH₃]/dt

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

Solution

The rate of reaction is related to the stoichiometric coefficients of the reactants and products. For this reaction, the rate expressions are -d[N₂]/dt = -1/3 d[H₂]/dt = 1/2 d[NH₃]/dt, making option A correct.

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