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Solution: 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?a) 31.6b) 48.2c) 64.7d) 78.3e) 92.5

Problem

An equilibrium mixture of H2, Iand 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?

a) 31.6

b) 48.2

c) 64.7

d) 78.3

e) 92.5

Solution

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:


Kp=PproductsPreactants     Kc=[products][reactants]


Note that solid and liquid compounds are ignored in the equilibrium expression.


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