Short answer·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A sample contains of .
Total: 3 marks
(a) How many moles of aluminium atoms are present? (1 mark)
(b) How many moles of oxygen atoms are present? (1 mark)
(c) How many formula units are present in terms of ? (1 mark)
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