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The equilibrium constant (Kc) for the reaction 2 HI ⇌ H2 + I2 can be calculated using the following equation:
Kc = ([H2][I2]) / [HI]^2
Substituting the given equilibrium concentrations:
Kc = (0.72 M
1.5 M) / (0.85 M)^2
Kc ≈ 1.49