The rate constant of a first-order reaction is 1 × 10−2 s−1 and the initial concentration of the reactant is 1 M. What is the initial rate of the reaction?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 1 × 10−2 M s−1
For a first-order reaction the rate is proportional to the first power of the reactant concentration. At the start, [R] = [R]0 = 1 M:
\( \displaystyle \text{Rate}=k[\mathrm{R}] \)
\( \displaystyle \text{Initial rate}=1\times10^{-2}\,\mathrm{s^{-1}}\times1\,\mathrm{M} \)
\( \displaystyle \text{Initial rate}=1\times10^{-2}\,\mathrm{M\,s^{-1}} \)