Rate of first order reaction $\mathrm{A} \rightarrow$ product is $0.01 \mathrm{~mol} \mathrm{dm}^{-3}…

Rate of first order reaction $\mathrm{A} \rightarrow$ product is $0.01 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~s}^{-1}$, calculate rate constant if concentration of reactant is $0.2 \mathrm{M}$ ?
  1. $0.05 \mathrm{sec}^{-1}$
  2. $0.1 \mathrm{sec}^{-1}$
  3. $0.5 \mathrm{sec}^{-1}$
  4. $0.01 \mathrm{sec}^{-1}$

Solution

$\mathrm{r}=\mathrm{K}(\mathrm{A})$ $0.01=K(0.2)$ $\mathrm{K}=\frac{0.01}{0.20}=0.05 \mathrm{sec}^{-1}$

Asked in: MHT CET 2022 (06 Aug Shift 1)

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