Chemistry

Problem

298\,\text{K}

the decomposition of

\mathrm{N_2O_5}

is first order with a rate constant

k = 3.5\times10^{-2}\;\text{s}^{-1}

. If the initial concentration of

\mathrm{N_2O_5}

0.80\,\text{M}

, approximately how many seconds are required for the concentration to fall to

0.10\,\text{M}

? a)

79\ \text{s}

26\ \text{s}

59\ \text{s}

140\ \text{s}