Calculate the rate constant of first order reaction if half life of reaction is 40 minutes.

Calculate the rate constant of first order reaction if half life of reaction is 40 minutes.
  1. $1.733 \times 10^{-2}$ minute $^{-1}$
  2. $1.951 \times 10^{-2}$ minute $^{-1}$
  3. $1.423 \times 10^{-2}$ minute $^{-1}$
  4. $1.256 \times 10^{-2}$ minute $^{-1}$

Solution

For a first order reaction, $k=\frac{0.693}{t_{1 / 2}}$ $\mathrm{k}=\frac{0.693}{40}=1.733 \times 10^{-2} \text { minute }^{-1}$

Asked in: MHT CET 2023 (12 May Shift 1)

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