Worked example: Calculating the equilibrium total pressure after a change in volume | Khan Academy | Summary and Q&A

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July 8, 2021
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Worked example: Calculating the equilibrium total pressure after a change in volume | Khan Academy

TL;DR

The video explains how to calculate the equilibrium partial pressures and total pressure of a decomposition reaction using Le Chatelier's principle and a quadratic equation.

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Q: What is the initial partial pressure of PCl5 after the volume is reduced to one liter?

The initial partial pressure of PCl5 is 1.96 atmospheres.

Q: How does the net reaction move when the volume is decreased?

The net reaction moves to the left to decrease the pressure according to Le Chatelier's principle.

Q: How can the equilibrium partial pressures be determined using a quadratic equation?

By plugging in the equilibrium partial pressures into the Kp expression and solving for x in the quadratic equation, the equilibrium partial pressures can be found.

Q: What is the equilibrium partial pressure of PCl3?

The equilibrium partial pressure of PCl3 is 1.07 atmospheres.

Summary & Key Takeaways

• The video discusses how to calculate the equilibrium partial pressures and total pressure of a decomposition reaction.

• It explains the use of an ICE table and the application of Le Chatelier's principle to determine the direction of the reaction.

• The video demonstrates the use of a quadratic equation to solve for the equilibrium partial pressures and provides a quantitative and qualitative analysis of the results.