If a reaction with `t1//2=69.3` second, has a rate constant value of `10^(-2)` per second. Calculate the order of the reaction.

In I order reaction the initial concentration of the reactant as 0.05 mole/litre and the rate constant 1.5xx10^(-3)" min"^(-1) . What is the initial rate of the reaction.

The area of a blot of ink is growing such that after t seconds, its area is given by A = (3t^(2) +7) cm^(2) . Calculate the rate of increase of area at t=5 second.