Problem: An equilibrium mixture of H2, I2, and HI at 458 oC contains 0.112 mol H2, 0.112 mol I2, and 0.775 mol HI in a 5.00-L vessel.What are the equilibrium partial pressure of HI when equilibrium is reestablished following the addition of 0.200 mol of HI?

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FREE Expert Solution

We are being asked to determine the equilibrium partial pressure of HI.

Reaction: 2 HI(g) ⇌ H2(g) + I2(g)


When dealing with equilibrium:

Kc → equilibrium units are in molarity 
Kp → equilibrium units in terms of pressure


To calculate for the equilibrium partial pressure, we will use KC.

Kc , like other equilibrium constants, is the ratio of products to reactants. 

Kc= productsreactants


We derive Kc for the reaction

KC=H2I2HI2

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Problem Details

An equilibrium mixture of H2, I2, and HI at 458 oC contains 0.112 mol H2, 0.112 mol I2, and 0.775 mol HI in a 5.00-L vessel.

What are the equilibrium partial pressure of HI when equilibrium is reestablished following the addition of 0.200 mol of HI?

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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 Chemical Equilibrium concept. You can view video lessons to learn Chemical Equilibrium. Or if you need more Chemical Equilibrium practice, you can also practice Chemical Equilibrium practice problems.

What professor is this problem relevant for?

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