the half life period of a first order rxn is 60 minutes what percentage will be left after 240 - Chemistry - Chemical Kinetics

Question

the half life period of a first order rxn is 60 minutes what
percentage will be left after 240 mnts????????????pls solve
this

Pankaj Singh · Accepted Answer

half life of a reaction $t_{1 / 2} = \frac{0 693}{k}$ for the given question $t_{1 / 2} = 60 \min$ using above equation $K = \frac{0 693}{60} = {1 155 \times 10}^{- 2} \min^{- 1}$ let, X% of the initial concentration of the reactant will be left after 240 min using $t_{\min} = \frac{2 304}{k} \log \frac{[A_{o}]}{0 0 X [A_{o}]}$ $240 = \frac{2 3034}{{1 155 \times 10}^{- 2}} \log \frac{1}{0 0 X}$ solving the above equation X = 6 26%

the half life period of a first order rxn. is 60 minutes.what percentage will be left after 240 mnts????????????pls solve this