Half life of a first order reaction is 1 hour. What fraction of it will remain after 3 hour?

Half life of a first order reaction is 1 hour. What fraction of it will remain after 3 hour?
  1. $\frac{1}{8}$
  2. $\frac{1}{9}$
  3. $\frac{1}{16}$
  4. $\frac{1}{64}$

Solution


$\because \quad$ Half life $\left(\mathrm{t}_{1 / 2}\right)=1$ hour $\therefore \quad$ Fraction available after 3 hours $=3 \times \mathrm{t}_{1 / 2}=\frac{1}{8}$

Asked in: MHT CET 2024 (04 May Shift 1)

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