Under identical concentrations and temperature

CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics

Problem

Under identical concentrations and temperature, the rate constant for a particular reaction is

k_1 = 1.6\times10^{-4}\,\text{s}^{-1}

in the absence of a certain solid additive and

k_2 = 4.0\times10^{-2}\,\text{s}^{-1}

when the additive is present. Approximately how many times faster is the initial rate when the additive is used? (a)

2.5\times10^{4}

(b)

2.5\times10^{2}

(c)

2.5\times10^{5}

(d)

2.5\times10^{3}