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3.2 Relative masses of atoms and molecules

Syllabus
0620–2026–2027
Topic
3.2
Level
—

3.2.1—Relative atomic mass, Ar, as the

  • Describe relative atomic mass, Ar, as the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of 12C

3.2.2—Relative molecular mass, Mr, as the

  • Define relative molecular mass, Mr, as the sum of the relative atomic masses. Relative formula mass, Mr, will be used for ionic compounds

3.2.3—Reacting masses in simple proportions

  • Calculate reacting masses in simple proportions. Calculations will not involve the mole concept

Objective notes

3 learning objectives
ConceptIGCSE Chemistry