Practice: Le Chatelier’s Principle

At equilibrium, a box contains five molecules each of gaseous compounds A, B and C. Shown in the diagram are the equilibrium gas mixtures obtained when molecules of A or B are added to the box without altering the total pressure.

Write a balanced chemical equation for the reaction taking place in the gas mixture.

  • AA+C2B
  • BA+BC
  • CA+2CB
  • DA+B2C
  • EA+2C2B

The total pressure of the original gas mixture is increased and the system is allowed to reach equilibrium. Assuming the temperature remains at the original value and no molecules are added or removed, which of the following situations could be observed?

  • A
  • B
  • C
  • D
  • E

Molecules are added or removed from the original gas mixture and the system is allowed to reach equilibrium. The temperature and pressure are fixed at their original values throughout this process. Which of the following changes cannot result in the situation shown?

  • AAdding B and removing A
  • BAdding A and C
  • CAdding B and C
  • DAdding A and C and removing B
  • EAdding C and removing A

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