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A first order reaction has a specific re...

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

A

138.6 s

B

346.5 s

C

693.0 s

D

238.6 s

Text Solution

Verified by Experts

The correct Answer is:
A
`t=(2.303)/(k)log.([A]_(0))/([A]_(t))`
or, `t=(2.303)/(10^(-2))log.(20)/(5)`
or, t = 138.6s
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