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(ii) The time for half life of first order reaction is 1 hr. What is time taken for87.5% completion of the reaction.

rakshana , 7 Years ago
Grade 11
anser 1 Answers
Arun

Last Activity: 7 Years ago

Dear Student
 
87.5 % means three half lives
As 87.5 % 
1st half life = 50%
2nd half life = 50 + 50% (50) = 50 +25 = 75%
3rd half life = 50 + 50 % (50) + 50% (25) = 87.5%
 
Hence total time taken = 3 hours
 
Regards
Arun (askIITians forum expert)

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