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A first order reaction has a rate consta...

A first order reaction has a rate constant `1.15 xx 10^-3s^-1`. How long will 5 g of this reactant take to reduce to 3g ?

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Hear,`[A]_0=5g, [A] =3g,k=1.15`xx 10^-3s^-1.`As the reaction is of 1st order,
t=2.303/k log[A]_0/[A] =2.303/1.15`xx`10^-3s^-1 log ((5g)/(3g)),
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