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An equilibrium mixture of H2, I2 and HI at 458°C contains 1.34 atm of H2, 1.34 atm of I2 and 9.30 atm of HI.
What is the equilibrium constant (Kp) for this reaction?
We’re being asked to determine the equilibrium constant at 458 ˚C for this reaction:
H2(g) + I2(g) ⇌ 2 HI(g)
Recall that the equilibrium constant is the ratio of the products and reactants.
We use Kp when dealing with pressure and Kc when dealing with concentration:
Note that solid and liquid compounds are ignored in the equilibrium expression.