alleryA reaction has the rate expression Rate = k[A]^3/2 [B]^-1. What is the overall order of the reaction?
A3/2
B1/2
C5/2
D-1
Answer & Solution
Correct answer: B. 1/2
1. Overall order is the algebraic sum of exponents.
2. Order $= \tfrac{3}{2} + (-1)$.
3. $= \tfrac{1}{2}$, i.e. half order.
4. Distractor C wrongly adds the magnitudes; distractor A ignores the negative term.
_Source: syllabus Chemistry Ch 3 "Chemical Kinetics", p.7_
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