A-LevelChemistryEquilibriaOct/Nov 2023Paper 1 Q151 Mark
0.200 mol of sulfur dioxide and 0.200 mol of oxygen are placed in a 1.00 dm³ sealed container. The gases are allowed to react until equilibrium is reached. 2SO2 + O2 ⇌ 2SO3 At equilibrium there is 0.100 mol of SO3 in the container. What is the value of Kc?
A0.150 mol dm⁻³
B0.800 mol dm⁻³
C1.25 mol⁻¹ dm³
D6.67 mol⁻¹ dm³
✓ Correct Answer
The correct answer is D: 6.67 mol⁻¹ dm³
📋 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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