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A first order reaction has a specific re...

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

A

`238.6sec`

B

`138.6sec`

C

`346.5sec`

D

`693.0sec`

Text Solution

Verified by Experts

The correct Answer is:
B
`K=10^(-2)=(0.693)/(t//2)`
So, `t//2=(0.693)/(10^(-2))=69.3sec`
Two half lives are required for the reduction of 20g reactant into 5g.
So, time required `=2xx69.3=138.6sec`.
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