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A first order reaction has a rate consta...

A first order reaction has a rate constant `1.15xx10^(-3)s^(-1)` . How long will 5g of this reactant take to reduce to 3g?

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Given, `[A]_(0)prop5g,[A]prop3g,k=1.15xx10^(-3)s^(-1)`
First a fist order reaction.
`t=(2.303)/(k)log.([A]_(0))/([A])=(2.303)/(1.15xx10^(-3))log.(5)/(3)=443.8s~=444s`
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