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For this reaction Kc is 55.2, increasing the stoichiometric coefficients the value is always the same ... H2 (g) + I2 (g) ⇄ 2 HI (g) risulta Kc=55.2 a 698 K. 2 H2 (g) +2 I2 (g) ⇄ 4 HI (g) Kc= [HI]² / [H₂][I₂]