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  • For a first order reaction Products, initial concentration of <img alt="\mathrm{ A\: is \: 0.1\: M}" s

For a first order reaction \mathrm{A} \rightarrow Products, initial concentration of \mathrm{ A\: is \: 0.1\: M} ,which become \mathrm{ 0.001\: M} after 5 minutes. Rate constant for the reaction in \mathrm{ min ^{-1} \: \: is}
 

Option: 1

0.9212


Option: 2

0.4606


Option: 3

0.2303


Option: 4

1.3818


Answers (1)

best_answer

For a first-order reaction, the integrated rate law expression is

\mathrm{\ln \left(\frac{A_{0}}{A_{t}}\right)=Kt} .\\

\mathrm{\Rightarrow \quad \ln \left(\frac{0.1}{0.001}\right)=K(5)}\\

\mathrm{\Rightarrow K=\frac{\ln 100}{5}=\frac{4.606}{5}=0.9212 \mathrm{~min}^{-1}}

hence correct option is 1

Posted by

avinash.dongre

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