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A first order reaction takes 69.3 min fo...

A first order reaction takes 69.3 min for 50% completion. What is the time in min for 80% completion?

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The correct Answer is:
A
`0.693/69.3=k`
`t=(2.303)/kxx"log"(R_(0))/Rimpliest=(2.303xx69.3)/0.693"log"100/20implies160.98` min
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