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For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens to the equilibrium if t

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Question: For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens to the equilibrium if the volume of the container is decreased? (2022)

Options:

  1. Equilibrium shifts to the left
  2. Equilibrium shifts to the right
  3. No effect on equilibrium
  4. Equilibrium constant changes

Correct Answer: Equilibrium shifts to the right

Exam Year: 2022

Solution: 

Decreasing the volume increases the pressure, and according to Le Chatelier\'s principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side (2 moles of SO3).

For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens to the equilibrium if t

Practice Questions

Q1
For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens to the equilibrium if the volume of the container is decreased? (2022)
  1. Equilibrium shifts to the left
  2. Equilibrium shifts to the right
  3. No effect on equilibrium
  4. Equilibrium constant changes

Questions & Step-by-Step Solutions

For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens to the equilibrium if the volume of the container is decreased? (2022)
  • Step 1: Understand that the reaction involves gases: 2SO2, O2, and SO3.
  • Step 2: Recognize that decreasing the volume of the container increases the pressure of the gases inside.
  • Step 3: Recall Le Chatelier's principle, which states that if a system at equilibrium is disturbed, it will shift to counteract the disturbance.
  • Step 4: Identify the number of moles of gas on each side of the reaction: the left side has 3 moles (2SO2 + O2) and the right side has 2 moles (2SO3).
  • Step 5: Since the pressure increases when the volume decreases, the equilibrium will shift towards the side with fewer moles of gas to reduce the pressure.
  • Step 6: Conclude that the equilibrium will shift to the right side, producing more SO3.
  • Le Chatelier's Principle – This principle states that if a system at equilibrium is subjected to a change in pressure, temperature, or concentration, the system will adjust to counteract that change and restore a new equilibrium.
  • Gas Moles and Volume Relationship – Understanding how changes in volume affect the pressure of gases and the equilibrium position based on the number of moles of gas on each side of the reaction.
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