Use the References to access important values if needed for this question.

$1)$The gas phase decomposition of dinitrogen pentoxide at $335K$

$N_2{O}_5(g)2N{O}_2(g)+\frac{1}{2}{O}_2(g)$

is first order in $N_2{O}_5$ with a rate constant of

$4\mathrm{.}70{10}^{-3}{s}^{-1}.$

If the initial concentration of $N_2{O}_5$ is $0\mathrm{.}118M,$ the concentration of $N_2{O}_5$ will be M after $291$ s have passed.

$2.)$ The gas phase decomposition of dinitrogen pentoxide at $335$ K

$N_2{O}_5(g)2N{O}_2(g)+\frac{1}{2}{O}_2(g)$

is first order in $N_2{O}_5$ with a rate constant of

$4\mathrm{.}70{10}^{-3}{s}^{-1}.$

If the initial concentration of $N_2{O}_5$ is $0\mathrm{.}178M,$ the concentration of $N_2{O}_5$ will be $0\mathrm{.}0381M$ after s have passed.