WAEC Chemistry 2014 Objective — Question 33
Question 33 of 50 from the West African Examinations Council (WAEC) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
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N₂+3H₂ ⇌ 2NH₃, ΔH=−x kJ mol⁻¹. Which of the following conditions would increase the yield of NH₃?
- A. Addition of iron catalyst
- B. Increase in the temperature of the system
- C. Increase in the volume occupied by reactants
- D. Increase in the total pressure of the systemCorrect
Explanation
Since the forward reaction is exothermic and results in fewer gas molecules, increasing the total pressure of the system favours the forward reaction, increasing the yield of NH3.
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