Chemistry (AS Level)·Atoms, molecules & stoichiometry · NSSCAS 1.1.1–1.1.2
Relative masses & the mole
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AS chemistry begins with counting the uncountable. Learn the precise definitions of relative atomic, isotopic, molecular and formula mass — all measured against the carbon-12 scale — and meet the mole and the Avogadro constant, the chemist's bridge between atoms and grams.
What you'll learn in this lesson
By the end you should be able to (NSSCAS Chemistry (AS Level) 1.1.1–1.1.2):
- Define and use relative atomic, isotopic, molecular and formula masses, based on the ¹²C scale
- Define and use the term mole in terms of the Avogadro constant
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