AQA · Chemistry · 8462
GCSE Chemistry: Moles
Quantitative chemistry · AQA GCSE Chemistry (8462), specification point 4.3.2.1. Cards are generated from the exam board's own specification for "Moles", and every card links back to the page it came from. Higher tier only. Specification © AQA — used with attribution.
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What is the unit used to measure chemical amounts?
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The mole (symbol: mol).
The symbol for the unit mole is ?.
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mol
What is the mass in grams of one mole of a substance numerically equal to?
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Its relative formula mass (Mr).
What is the value of the Avogadro constant?
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6.02 × 10²³ per mole.
What does the Avogadro constant represent?
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The number of atoms, molecules or ions in one mole of a given substance.
How does the number of particles in one mole of one substance compare to one mole of another?
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It is the same — one mole of any substance contains the same number of stated particles.
How does the number of atoms in one mole of carbon compare to the number of molecules in one mole of carbon dioxide?
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They are equal — both contain 6.02 × 10²³ particles.
How do you calculate the number of moles from a given mass of a substance?
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moles = mass (g) ÷ relative formula mass (Mr).
How do you calculate the mass of a given number of moles of a substance?
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mass (g) = moles × relative formula mass (Mr).
What is the mass of 2 moles of water (H₂O, Mr = 18)?
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36 g (2 × 18).
Is the topic of moles assessed at Foundation or Higher tier in AQA GCSE Chemistry?
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Higher tier only (HT only).
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