Q. Two substances and decompose in solution independently, both following first order kinetics. The rate constant of is twice that of . In an experiment, the solution initially contained millimoles of and of . The molarities of and will be equal just at the end of time equal to

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Solution:

Substance Substance
rate constant
Half life period

where number of half life period
Amount of left
Amount of left
Equating both
or
is half life of and twice the half -life of