`.^(131)I` has half life period 13.3 hour. After 79.8 hour, what fraction of `.^(131)I` will remain ?

The half-life period of a radioactive element is 1 h. After 3 h, what fraction of it will remain?

After five half-life periods for a first order reaction, what fraction of reactant remains ?

After five half life periods for a first order reaction what fraction of reactant remains ?

Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction 3 hours. Calculate fraction of sucrose which will remain after 8 hours.

The isotope ""_(19) K^(42) has a half life of about 12 hours. What fraction of the initial concentration of ""_(19)K^(42) remains after 48 hours.

In a first order of reaction the reacting substance has half-life period of ten minutes. What fraction of the substance will be left after an hour the raction has occurred ?