A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2014Paper 1 Q291 Mark
Which equation correctly represents the balanced equation for the complete combustion of a hydrocarbon with the formula CₓHᵧ?
ACₓHᵧ + (x + y/2)O₂ → xCO₂ + y/2 H₂O
BCₓHᵧ + (x + y/4)O₂ → xCO₂ + y/2 H₂O
CCₓHᵧ + (x + y/2)O₂ → xCO₂ + y/4 H₂O
DCₓHᵧ + (x + y/4)O₂ → xCO₂ + y/4 H₂O
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of atoms, molecules and stoichiometry within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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