Question

Equilibrium constant for the reaction $2NO\left(g\right)+C{l}_2\left(g\right)\rightleftharpoons 2NOCl\left(g\right)$ is correctly given by the expression:

• A. $K=\frac{\left[2NOCl\right]}{\left[2NO\right]\left[C{l}_2\right]}$
• B. $K=\frac{{\left[2NOCl\right]}^2}{{\left[NO\right]}^2\left[C{l}_2\right]}$
• C. $K=\frac{{\left[NOCl\right]}^2}{{\left[N{O}_2\right]}^2\left[C{l}_2\right]}$
• D. $K=\frac{{\left[NOCl\right]}^2}{{\left[NO\right]}^2\left[C{l}_2\right]}$

Answer 1

The correct option is D $K=\frac{{\left[NOCl\right]}^2}{{\left[NO\right]}^2\left[C{l}_2\right]}$

The reaction is $2NO\left(g\right)+C{l}_2\left(g\right)\leftrightharpoons 2NOCl\left(g\right)$.

The equilibrium constant of a reaction is the ratio of the equilibrium concentrations of products to the equilibrium concentrations of reactants. The concentration terms are raised to appropriate powers which are equal to stoichiometric coefficients.

The expression for the equilibrium constant will be $K=\frac{{\left[NOCl\right]}^2}{{\left[NO\right]}^2\left[C{l}_2\right]}$.