If $0.20\,\text{mol}$ of hydrogen gas and $0.15\,\text{mol}$ of iodine gas are heated to $723\,\text{K}$ and allowed to reach equilibrium, the equilibrium mixture includes $0.26\,\text{mol}$ of hydrogen iodide. The reaction is represented by the equation below. $\text{H}_2(\text{g}) + \text{I}_2(\text{g}) \rightleftharpoons 2\text{HI}(\text{g})$ What is the correct equilibrium constant expression for $K_c$?
- A$\dfrac{2 \times 0.26}{0.20 \times 0.15}$
- B$\dfrac{(2 \times 0.26)^2}{0.20 \times 0.15}$
- C$\dfrac{(0.26)^2}{0.07 \times 0.02}$
- D$\dfrac{(0.26)^2}{0.13 \times 0.13}$