In the reaction

CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance

Problem

In the reaction

2\,\text{N}_2\text{O}_5 \rightarrow 4\,\text{NO}_2+\text{O}_2

, the initial concentration of

\text{N}_2\text{O}_5

0.400\,\text{M}

. After some time has elapsed, the concentration of

\text{NO}_2

is found to be

0.120\,\text{M}

. What is the concentration of

\text{N}_2\text{O}_5

at that time? (a)

0.060\,\text{M}

(b)

0.280\,\text{M}

(c)

0.340\,\text{M}

(d)

0.240\,\text{M}