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A first order reaction takes 69.3 minute...

A first order reaction takes 69.3 minutes for 50% completion. Calculate the time required for 80% completion of the reaction.

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`k = (2.303)/(69.3) "log 2"`
`= (2.303 xx 0.301)/(69.3)`
`=0.01 "min"^(-1)`
`t = (2.303)/(0.01) "log5"`
`= (2.303 xx 0.6996)/(0.01)`
`t = 161 `min
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