A first order reaction is 60% complete i...

A first order reaction is 60% complete in 20 min. How long will the reaction take to be 84% complete?

A

68 min

B

40 min

C

76 min

D

54 min

Text Solution

Verified by Experts

The correct Answer is:

B

for a first order reaction,
`k=2.303/tlog""(a)/(a-x)`case i
`k=2.303/20log""(100)/(100-60)=0.045`case ii`k=2.303/20log""(100)/(100-60)=0.045`
`t=2.303/0.045log""100/16=40.73`min

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