When gaseous nitrosyl chloride, NOCl (g), decomposes, the following equilibrium is established:

$${\text{2NOCl(g)}} \rightleftharpoons {\text{2NO(g)}} + {\text{C}}{{\text{l}}_2}{\text{(g)}}$$

2.0 mol of NOCl(g) were placed in a ${\text{1.0 d}}{{\text{m}}^{\text{3}}}$ container and allowed to reach equilibrium. At equilibrium 1.0 mol of NOCl(g) was present. What is the value of ${K_{\text{c}}}$?

A.     0.50

B.     1.0

C.     1.5

D.     2.0

A