The **order of a reaction** is defined as:
AThe sum of the exponents of concentration terms in the experimental rate law
BAlways equal to the molecularity
CThe sum of stoichiometric coefficients in the balanced equation
DThe number of reactant molecules in the equation
Answer & Solution
Correct answer: A. The sum of the exponents of concentration terms in the experimental rate law
For rate = $k[A]^x[B]^y$, order = $x + y$, determined **experimentally**. It need not equal the stoichiometric coefficients or molecularity.
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