The rate constant of a first order reaction is "4" 10-3S-1, At a reactant concentration of 0.02 M, the rate of reaction would be

According to chemical kinetics, the rate law is Rate, r k[conc. of reactant] = And then, rate of reaction is

$r = 4 \times 10^{- 3} S^{- 1} \times 0.02 M$

$∴ Rate, r = 8 \times 10^{- 5} {ms}^{- 1}$

The rate constant of a first order reaction is "4" $10^{- 3} S^{- 1},$ At a reactant concentration of 0.02 M, the rate of reaction would be