For the following reaction ${K_{\text{c}}} = 1.0 \times {10^{ - 5}}$ at 30 °C.

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

Which relationship is correct at equilibrium at this temperature?

A.     The concentration of NO equals the concentration of NOCl.

B.     The concentration of NOCl is double the concentration of ${\text{C}}{{\text{l}}_{\text{2}}}$.

C.     The concentration of NOCl is much greater than the concentration of ${\text{C}}{{\text{l}}_{\text{2}}}$.

D.     The concentration of NO is much greater than the concentration of NOCl.

C

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