Consider a certain reaction `A rarr` Products with `k=2.0xx10^(-2)s^(-1)`. Calculate the concentration of `A` remaining after `100s` if the initial concentration of `A` is `1.0 mol L^(-1)`.

Explanation

The units of k show that the reaction is of first order. Hence, `k=(2.303)/(t)log""([A]_(0))/([A])`
`:.2.0xx10^(-2)s^(-1)=(2.303)/(100s)log""(1.0" mol L"^(-1))/([A])" or "log[A]=-0.8684`
`:.[A]=" Antilog"(-0.8684)=" Antilog "(1.1316)=.1354" mol L"^(-1).`