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For the reaction: H2(g) + I2(g) ⇌ 2 HI(g), with equilibrium concentrations [H2] = 0.1 M, [I2] = 0.1 M, and [HI] = 0.4 M, calculate the equilibrium constant K.

For the reaction: H₂(g) + I₂(g) ⇌ 2 HI(g), with equilibrium concentrations [H₂] = 0.1 M, [I₂] = 0.1 M, and [HI] = 0.4 M, calculate the equilibrium constant K.