A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2011Paper 1 Q41 Mark

Use of the Data Booklet is relevant to this question. 560 kg of nitrogen and 120 kg of hydrogen are pressurised, heated and passed over an iron catalyst. When the mixture of gases reaches equilibrium, it contains 96 kg of hydrogen. Which mass of ammonia does it contain?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is C: 136 kg.

Q: What topic does this question test?

This question tests Atoms, molecules and stoichiometry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

A24 kg

B68 kg

C136 kg

D680 kg

✓ Correct Answer

The correct answer is C: 136 kg

📋 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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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Atoms, molecules and stoichiometry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2011 examination, Paper 1 Variant 2.

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