A substance 'A' decomposes by a first order reaction starting initially with $[\mathrm{A}]=2.00 \mathrm{~m}$ and after $200 \mathrm{~min},[\mathrm{~A}]$ becomes $0.15 \mathrm{~m}$. For this reaction $t_{1 / 2}$ is

Question

A substance 'A' decomposes by a first order reaction starting initially with $[\mathrm{A}]=2.00 \mathrm{~m}$ and after $200 \mathrm{~min},[\mathrm{~A}]$ becomes $0.15 \mathrm{~m}$. For this reaction $t_{1 / 2}$ is, $53.72 \mathrm{~min}$, $50.49 \mathrm{~min}$, $48.45 \mathrm{~min}$, $46.45 \mathrm{~min}$

MARKS App · Accepted Answer

Given initial concentration (a) $=2.00 \mathrm{~m}$; Time taken $(t)=200 \mathrm{~min}$ and final concentration $(\mathrm{a}-\mathrm{x})=0.15 \mathrm{~m}$. For a first order reation rate constant,

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