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  4. A first order reaction has a specific reaction rate of 10-2 sec-1. How much time will it take for 20 g of the reactant to reduce to 5 g ?

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Q. A first order reaction has a specific reaction rate of $10^{-2} \, sec^{-1}$. How much time will it take for $20\, g$ of the reactant to reduce to $5\, g$ ?

NEETNEET 2017Chemical Kinetics

Solution:

$t _{1 / 2}=\frac{0.693}{10^{-2}}$ second

For the reduction of $20\, g$ of reactant to $5\, g$, two $t _{1 / 2}$ is required.

$t =2 \times \frac{0.693}{10^{-2}}$ second

$=138.6$ second