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CAIE A-Level Chemistry 2.3.3 Empirical and Molecular Formulae

Practise distinguishing the simplest atom ratio from the actual number of each atom in a molecule.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • define empirical formula as the simplest whole-number ratio of atoms of each element in a compound
  • define molecular formula as the actual number of atoms of each element in one molecule
  • reduce molecular formula subscripts only when asked for the empirical formula

2.3.3—Terms: empirical and molecular formula question 1

[Maximum number: 1]

Ethanedioic acid, HO2CCO2H\mathrm{HO}_{2} \mathrm{CCO}_{2} \mathrm{H}, has a relative molecular mass of 90.0.

State the empirical formula of ethanedioic acid.

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