For a reaction with the rate equation rate = k[A][B]^2, the overall order of the reaction is
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
Overall order is the sum of the individual orders, so 1 for A plus 2 for B gives 3. The reaction is first order in A and second order in B, and doubling the concentration of B alone would therefore quadruple the rate while doubling A alone would only double it. Adding rather than multiplying the exponents is the step candidates most often get wrong.
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About Order of Reaction
Reaction order shows how the rate depends on the concentration of each reactant, as expressed in the rate law. Coverage includes zero, first and second-order reactions, integrated rate equations, half-life, units of rate constants and the distinction between overall order and molecularity.
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