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What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s)...

Chemistry
JAMB 1986

What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?

  • A. The equilibrium is driven to the left
  • B. The equilibrium is driven to the right
  • C. There is no effect
  • D. More ZnO is produced
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Correct Answer: Option B
Explanation

According to Le Chatelier's Principle, increasing the pressure on a system at equilibrium will cause the equilibrium to shift toward the side with the fewer number of moles of gas to counteract the change.

                   ZnO(s) + H\(_2\)(g) → Zn(s) + H\(_2\)O(I)

Reactant side: Contains 1 mole of gas (H\(_2\)). Solid ZnO does not contribute to gas pressure.

Product side: Contains 0 moles of gas. Both Zn is a solid and H\(_2\)O is a liquid in this specific equation.

Result: Since the product side has fewer moles of gas (0 vs 1), increasing the pressure drives the equilibrium to the right (forward direction). 


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