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For the reaction 2A + B → 3C + D which of the following does not express the reaction rate?

1. -d[B]/dt
2. d[D]/dt
3. -1/2 d[A]/dt
4. -1/3 d[C]/dt

Correct answer: -1/3 d[C]/dt

Solution

The rate of reaction is expressed as the change in concentration of reactants or products per unit time, divided by their stoichiometric coefficients. Option D, -1/3 d[C]/dt, is incorrect because the coefficient of C is 3, so the correct term should be +1/3 d[C]/dt.

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