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  • If 75 % of a first order reaction was completed in 80 minuter, 50 % of the same relation would be completed in approximately (in minutes)Option: 1

If 75 % of a first order reaction was completed in 80 minuter, 50 % of the same relation would be completed in approximately (in minutes)

Option: 1

50


Option: 2

60


Option: 3

40


Option: 4

30


Answers (1)

best_answer

\mathrm{ \begin{aligned} & t_{75}=2 t_{50} \\ & t_{50}=40 \mathrm{min} \end{aligned} }

Half life

\mathrm{ \begin{aligned} \frac{0.693}{k} & =40 \mathrm{~min} \\ k & =\frac{0.693}{40} \mathrm{~min}^{-1} \end{aligned} }

\mathrm{\begin{aligned} & t=\frac{2.303}{0.693} \times 40 \log \left(\frac{100}{50}\right) \\ & t=40 \mathrm{~min} \end{aligned}}

 

Posted by

Gautam harsolia

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