Consider the reaction

CHEMISTRY · Single correct · CBSE · Chemistry · Some Basic Concepts of Chemistry · Some Basic Concepts of Chemistry

Problem

2\,\text{NO}+\text{O}_2 \rightarrow 2\,\text{NO}_2

. A reaction mixture initially contains

0.400\,\text{M}\,\text{NO}

and

0.300\,\text{M}\,\text{O}_2

. After 120 s, the concentration of

\text{NO}_2

is measured to be

0.150\,\text{M}

. What is the concentration of

\text{O}_2

at 120 s? (a)

0.150\,\text{M}

(b)

0.225\,\text{M}

(c)

0.075\,\text{M}

(d)

0.300\,\text{M}