Problem

A reaction, which is second order, has a rate constant of

0.002 \text{ L mol}^{-1} \text{ s}^{-1}

. If the initial conc. of the reactant is

0.2 \text{ M}

. how long will it take for the concentration to become

0.04 \text{ M}

? (a)

1000 \text{ sec}

(b)

400 \text{ sec}

(c)

200 \text{ sec}

(d)

10,000 \text{ sec}