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A first order reaction is 20% completed in 10 minutes. Calculate : The time taken for the reaction to go to 75% completion?
let the intial concentration of A = 1
k=2.303/t*log(a/a'') given a''=.80 then t=10
and by putting it into the expression value of k=2.303/100
now after 75% completion a''=0.25
on calculating t= 60 min <-------------- ans
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