1.

If 50 % of the reactant is converted into a product in first order reaction in 25 minutes how much of it would react in 100 minutes ?

Answer»

93. 75 %
`87.5%`
`75%`
`100 % `

Solution :`t_(1//2) = 25` MIN
Number of half - lives in 100 min =`(100)/(25)=4`
`:.` FRACTION of substance remaining after 100 min `= (1)/(2^(4)) = (1)/(16)`
Thefraction of substance REACTED in 100 min .
`= 1- (1)/(16)=(15)/(16)=0.9375`
% of substance reacted = 93.75 %


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