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