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

Explanation

`[(A)]_(0)=5 (g)` `[(A)] =3 (g), `(k)=1.15*10^(-3) (s)^(-1)` `(t)=(2.303)(k) log ([(A)]_(0)([(A)]) &=(2.303)(1.15 xx 10^(-3) (s)^(-1)) xx log (5)(3)
=444 (s)`