# At equilibrium the concentration of ${H}_{2},{I}_{2}$ and HI in a reaction chamber kept at 773 K is $\left[{H}_{2}\right]$= 0.42 mole $lite{r}^{-1},\left[{I}_{2}\right]$ = 0.042 mole $lite{r}^{-1};\left[HI\right]$ = 3.52 moles $lite{r}^{-1}$. The value of the equilibrium constant for the reaction ${H}_{2}+{I}_{2}⇋$2HI is

0.712

0.75

71.5

31.5

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