1.

A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed. (Given : log2=0.3010, log3=0.4771,log4=0.6021)

Answer»


SOLUTION :PROCEED as in Solved Problem 3.
`K=(2.303)/(20)LOG""(a)/(a-0.25a)=(2.303)/(20)log""(4)/(3)=0.0144" min"^(-1)`
`t=(2.303)/(k)log""(a)/(a-0.75a)=(2.303)/(0.0144)log4=96.3" min"`


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