A first order reaction takes 69.3 minute...

A first order reaction takes `69.3` minutes for `50%` completion. How much time will be needed for `80%` completion?

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The correct Answer is:

160.98

`(0.693)/(69.3) = K`
`t = (2.303 )/(K) xx log (R_(0))/(R) rArr t = (2.303 xx 69.3)/(0.693) log.(100)/(20) rArr 160.98 min`

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