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Question
A first order reaction has a rate constant 1.5×10−3sec−1. How long will 5.0 g of this reactant take to reduce to 1.25 g.
A first order reaction has a rate constant 1.5×10−3sec−1. How long will 5.0 g of this reactant take to reduce to 1.25 g.
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Solution
The correct option is A 924 sec
As we know, for a first order reaction,t1/2=0.693/k and time taken for 5 gm to reduce to 1.25 gm ist=2t1/2=2×0.693/1.5×10−3=924 sec
As we know, for a first order reaction,
t1/2=0.693/k and time taken for 5 gm to reduce to 1.25 gm is
t=2t1/2=2×0.693/1.5×10−3=924 sec
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