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JAMB Chemistry 1991 Question 29

Question 29

Chemical Equilibrium

NO(g) + CO(g) ⇌ ½N2(g) + CO2(g) ΔH = −89.3 kJ. What conditions would favour maximum conversion of nitrogen (II) oxide and carbon (II) oxide in the reaction above?

  1. A.Low temperature and high pressure
  2. B.High temperature and low pressure
  3. C.High temperature and high pressure
  4. D.Low temperature and low pressure.
Show the answer and explanation

Answer: A (Low temperature and high pressure)

Explanation

The forward reaction is exothermic, so low temperature favours it. It goes from 2 moles of gas to 1.5 moles, so high pressure also pushes it forward.