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For the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen if the volume of t

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Question: For the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen if the volume of the container is increased? (2020)

Options:

  1. Equilibrium shifts to the right
  2. Equilibrium shifts to the left
  3. No change in equilibrium
  4. Equilibrium shifts to the center

Correct Answer: Equilibrium shifts to the left

Exam Year: 2020

Solution: 

Increasing the volume decreases the pressure, and according to Le Chatelier\'s principle, the equilibrium will shift to the side with more moles of gas, which is the left side in this case.

For the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen if the volume of t

Practice Questions

Q1
For the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen if the volume of the container is increased? (2020)
  1. Equilibrium shifts to the right
  2. Equilibrium shifts to the left
  3. No change in equilibrium
  4. Equilibrium shifts to the center

Questions & Step-by-Step Solutions

For the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen if the volume of the container is increased? (2020)
  • Step 1: Understand the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g). This means that 2 moles of sulfur dioxide (SO2) and 1 mole of oxygen (O2) can produce 2 moles of sulfur trioxide (SO3).
  • Step 2: Identify the total number of gas moles on each side of the reaction. On the left side (reactants), there are 2 moles of SO2 + 1 mole of O2 = 3 moles of gas. On the right side (products), there are 2 moles of SO3.
  • Step 3: Recognize that increasing the volume of the container decreases the pressure inside the container.
  • Step 4: Apply Le Chatelier's principle, which states that if a system at equilibrium is disturbed, it will shift in a direction that counteracts the disturbance.
  • Step 5: Since increasing the volume decreases the pressure, the equilibrium will shift towards the side with more moles of gas to increase the pressure back.
  • Step 6: Determine which side has more moles of gas. The left side has 3 moles (2SO2 + 1O2) and the right side has 2 moles (2SO3).
  • Step 7: Conclude that the equilibrium will shift to the left side (reactants) because it has more moles of gas.
  • Le Chatelier's Principle – A principle stating that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change.
  • Gas Laws – Understanding how changes in volume affect pressure and the behavior of gases in a reaction.
  • Stoichiometry of Gases – Analyzing the number of moles of gas on each side of a chemical equation to predict shifts in equilibrium.
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