# For the reaction ${H}_{2}+{I}_{2}⇋2HI$ the equilibrium constant (K) is

$\frac{{\left[HI\right]}^{2}}{{\left[{H}_{2}\right]}^{2}\left[{I}_{2}\right]}$

$\frac{\left[HI\right]}{\sqrt{\left[{H}_{2}\right]}\sqrt{\left[{I}_{2}\right]}}$

$\frac{\left[{H}_{2}\right]\left[{I}_{2}\right]}{{\left[H+I\right]}^{2}}$

$\frac{{\left[HI\right]}^{2}}{\left[{H}_{2}\right]\left[{I}_{2}\right]}$

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