A-LevelChemistryAtoms, molecules and stoichiometryMay/June 2016Paper 1 Q141 Mark
A 0.005 mol sample of anhydrous calcium carbonate was completely thermally decomposed to give 100 cm³ of gas measured at a certain temperature and pressure. In a separate experiment carried out at the same temperature and pressure, a 0.005 mol sample of anhydrous calcium nitrate was completely thermally decomposed. The volume of gaseous products was measured. What total volume of gaseous products was produced from the calcium nitrate?
A50 cm³
B100 cm³
C200 cm³
D250 cm³
✓ Correct Answer
The correct answer is D: 250 cm³
📋 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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