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In a first order reaction, 75% of the re...

In a first order reaction, `75%` of the reactants disappeared in `1.386 hr`. What is the rate constant ?

A

`3.6 xx 10^(-3) s^(-1)`

B

`2.8 xx 10^(-4) s^(-1)`

C

`17.2 xx 10^(-3) s^(-1)`

D

`1.8 xx 10^(-3) s^(-1)`s

Text Solution

Verified by Experts

`k = 2.303/t log. ([A]_0)/[A]_t=2.303/(1.386xx 60 xx 60) log. (100)/25`
`=2.303/(1.386 xx 60 xx 60)log 4 = 2.8 xx 10^(-4)s^(-1)`
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