The rate constant for a first order reaction is $4.606 imes 10^{-3}$ $s^{-1}$. The time required to reduce 2.0 g of the reactant to 0.2 g is :

Question

The rate constant for a first order reaction is $4.606 	imes 10^{-3}$ $s^{-1}$. The time required to reduce 2.0 g of the reactant to 0.2 g is :

Dr. Abubacker · Accepted Answer

[Solution] $t = \frac{2.303}{k}\log\frac{2.0}{0.2} = \frac{2.303}{4.606 	imes 10^{-3}} = 500$ s. Answer (2).