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GCSE Combined Science · key term
A measure of how many specified particles a sample contains, measured in moles.
Used by AQA and OCR
Specification 4.5.2.4 · Paper 3, Paper 4
Revise: Amounts in MolesAtoms, molecules and ions are far too small and numerous to count individually, so chemists measure amount of substance in moles, with the unit symbol mol.
Specification C3.1i · Chemistry Paper 1
A measure of how many specified particles a sample contains, measured in moles (mol).
Mᵣ has no unit; mass has a unit such as g, and amount of substance has the unit mol.
Show your equation, substitution and final answer with its unit: mol for amount of substance, g for mass.
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A balance measures the mass of a sample, but chemists also need its amount of substance: how many particles it contains, expressed in moles. These describe different things. Equal amounts in moles contain equal numbers of the specified particles, but they need not have equal masses because different particles have different masses.
