Here it is
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H2(g) + I2 (g) <---> 2HI (g)
now K = [HI]^2/[H2] [I2]
All equilibrium concentrations are given in grams
Convert g HI to moles HI to molarity HI (assuming volume in all cases as 1L)
Same with I2 and H2 and plug in the values in the above expression.