A first order reaction has a rate constant 1. | vedclass

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Question

(A) For a first order reaction,the time required for the concentration to reduce to half of its initial value is the half-life period $(t_{1/2})$.Sinc

Vedclass · Accepted Answer

$630$

Vedclass · Answer

(A) For a first order reaction,the time required for the concentration to reduce to half of its initial value is the half-life period $(t_{1/2})$.Since the reactant reduces from $6 \ g$ to $3 \ g$,it is exactly one half-life.The formula for the half-life of a first order reaction is $t_{1/2} = \frac{0.693}{K}$.Given $K = 1.1 	imes 10^{-3} \ s^{-1}$.Substituting the value: $t_{1/2} = \frac{0.693}{1.1 	imes 10^{-3} \ s^{-1}} = 630 \ s$.

$A$ first order reaction has a rate constant $1.1 \times 10^{-3} \ s^{-1}$. How long will $6 \ g$ of this reactant take to reduce to $3 \ g$ (in $s$)?

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