Photo AI
In which one of the following would the position of the equilibrium not be affected by a volume change at constant temperature? A - VCE - SSCE Chemistry - Question 3 - 2002 - Paper 1
Question 3
In which one of the following would the position of the equilibrium not be affected by a volume change at constant temperature? A. 2CO(g) + O2(g) ⇌ 2CO2(g) B. C2H4(... show full transcript
Worked Solution & Example Answer:In which one of the following would the position of the equilibrium not be affected by a volume change at constant temperature? A - VCE - SSCE Chemistry - Question 3 - 2002 - Paper 1
Step 1
B. C2H4(g) ⇌ C2H6(g) + H2(g)
Answer
To determine in which reaction the equilibrium position would not be affected by a volume change, we should consider the number of moles of gas on both sides of the reaction.
For reaction B:
- Left side: 1 mole of C2H4(g)
- Right side: 1 mole of C2H6(g) + 1 mole of H2(g) = 2 moles
Here, a change in volume will indeed affect the position of equilibrium since the number of moles on the right side is greater than that on the left.
Evaluating each option:
- Option A has a reactant side of 3 moles and product side of 2 moles, indicating an equilibrium shift.
- Option B, already analyzed, shows an equilibrium shift due to an increase in moles on the product side.
- Option C involves an equilibrium of 4 moles on the reactant side and 2 moles on the product side, leading to a shift as well.
- Only Option D has 2 moles on the reactants side (1 CO and 1 H2O) and 2 moles on the products side (1 H2 and 1 CO2), indicating that a change in volume would not affect the equilibrium position.
Thus, the answer is option D.