1.

A firstorderreaction is 50% completed in1.26 xx 10^(14)s. Howmuchtimewouldittakefor100%completion ?

Answer»

`1.26 xx 10^(15)s`
`2.52 xx10^(14) s`
`2.52 xx 10^(28)s`
Infinite

Solution :The TIME takenfor halfthe reaction to complete i.e., the time in whichtheconcentrationof a reactantis reduced to halfof its origianal value is CALLED half- lineperiod of the reaction.
Butit isimpossibleto perform 100% of the reaction. wholeof the substance new reacts because in very half - life, 50% of the substance reacts. HENCE, time taken 100% COMPLETION of a reaction is infinite.


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