alleryThe **rate constant** $k$ in a rate law equals the rate of reaction when:
AAll reactant concentrations are zero
BAll reactant concentrations are unity
CTemperature is zero kelvin
DTime is zero
Answer & Solution
Correct answer: B. All reactant concentrations are unity
Putting unit concentrations into rate = $k[A]^x[B]^y$ gives rate = $k$.
**So $k$ is the rate at unit concentrations of all reactants.**
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