# Problem: 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

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###### FREE Expert 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:

$\overline{){{\mathbf{K}}}_{{\mathbf{p}}}{\mathbf{=}}\frac{{\mathbf{P}}_{\mathbf{products}}}{{\mathbf{P}}_{\mathbf{reactants}}}}$     $\overline{){{\mathbf{K}}}_{{\mathbf{c}}}{\mathbf{=}}\frac{\mathbf{\left[}\mathbf{products}\mathbf{\right]}}{\mathbf{\left[}\mathbf{reactants}\mathbf{\right]}}}$

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

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 What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Equilibrium Expressions concept. If you need more Equilibrium Expressions practice, you can also practice Equilibrium Expressions practice problems.

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Based on our data, we think this problem is relevant for Professor TBA's class at UBC.