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For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the

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Question: For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume? (2021)

Options:

  1. The equilibrium shifts to the left.
  2. The equilibrium shifts to the right.
  3. The equilibrium remains unchanged.
  4. The reaction stops.

Correct Answer: The equilibrium shifts to the right.

Exam Year: 2021

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 in this case.

For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the

Practice Questions

Q1
For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume? (2021)
  1. The equilibrium shifts to the left.
  2. The equilibrium shifts to the right.
  3. The equilibrium remains unchanged.
  4. The reaction stops.

Questions & Step-by-Step Solutions

For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume? (2021)
  • Step 1: Understand that the reaction involves gases: 2SO2, O2, and SO3.
  • Step 2: Count the number of gas molecules on each side of the reaction.
  • Step 3: On the left side (reactants), there are 2 SO2 + 1 O2 = 3 moles of gas.
  • Step 4: On the right side (products), there are 2 SO3 = 2 moles of gas.
  • Step 5: Recognize that decreasing the volume of the container increases the pressure of the gases inside.
  • Step 6: Apply Le Chatelier's principle, which states that if a system at equilibrium is disturbed, it will shift to counteract the disturbance.
  • Step 7: Since the pressure increases, the equilibrium will shift towards the side with fewer moles of gas.
  • Step 8: In this case, the right side has fewer moles (2 moles of SO3) compared to the left side (3 moles of gas).
  • Step 9: Therefore, the equilibrium will shift to the right, producing more SO3.
  • Le Chatelier's Principle – This principle states 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 chemical reaction.
  • Stoichiometry of Gases – Analyzing the number of moles of gas on each side of a chemical equation to determine the effect of volume changes.
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