A-LevelChemistryEquilibriaFeb/Mar 2024Paper 1 Q131 Mark
Nitrogen and hydrogen are mixed in a reaction vessel. The reaction reaches equilibrium giving a mixture of nitrogen, hydrogen and ammonia gases. N₂ + 3H₂ ⇌ 2NH₃ The mixture of gases present at equilibrium at a total pressure of 300 atm is shown. gas: nitrogen, number of mol in mixture: 180 gas: hydrogen, number of mol in mixture: 590 gas: ammonia, number of mol in mixture: 160 What is the equilibrium constant, Kp, for the forward reaction?
A6.65 x 10⁻⁶ atm⁻²
B7.13 x 10⁻⁵ atm⁻²
C0.599 atm⁻²
D1.50 x 10⁵ atm⁻²
✓ Correct Answer
The correct answer is A: 6.65 x 10⁻⁶ atm⁻²
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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