Write the equation useful to calculate half life (t_1/2) values for zero and first order reactions .

Let R$\to$P
1) Zero order : ${\mathrm{t}}_{1/2}=\frac{[\mathrm{R}{]}_0}{2\mathrm{k}}$
(where [R]₀ = initial concentration of reactant of R.)
(half - life of zero order reaction is dependant of initial concentration of the reactant)
2) First order : ${\mathrm{t}}_{1/2}=\frac{0.693}{\mathrm{k}}$
(half-life of first order reaction is independent of initial concentration of the reactant)