A-LevelChemistryAtoms, molecules and stoichiometryMay/June 2019Paper 1 Q61 Mark
X, Y and Z are all gases that behave ideally and react according to the equation shown. X(g) + 2Y(g) → 2Z(g) When 3.0 mol of X and 3.0 mol of Y are placed inside a container with a volume of 1.0 dm³, they react to form the maximum amount of Z. The final temperature of the reaction vessel is 120 °C. What is the final pressure inside the reaction vessel?
A4.49 × 10⁶ Pa
B9.80 × 10⁶ Pa
C1.47 × 10⁷ Pa
D1.96 × 10⁷ Pa
✓ Correct Answer
The correct answer is C: 1.47 × 10⁷ Pa
📋 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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