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For a first order reaction, it takes 16 ...

For a first order reaction, it takes 16 min to complete 50% reaction. How much time does it take to complete 75% reaction?

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`t_1/2=16 minutes`
Rate constant (K)=`0.693/K=0.693/(16min)`
For`25%` reaction ,use the relation `t=0.693/K(log)a/(a-x)`.
Here `a=100,(a-x)=100-75=25 `
`t=2.303/(0.693/(16min))(log)100/25=2.303xx16min/0.696log4`
`(2.303xx16xx0.6020)/0.693=32`minutes.
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