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CAIE IGCSE Chemistry 3.1.2 Molecular formula of a compound as the

CAIE IGCSE Chemistry 3.1.2 Molecular formula of a compound as the
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise reading molecular formulae from structures and formula lists by counting each type of atom in one molecule.

How this is tested

  • count atoms in a displayed molecule to select the correct molecular formula
  • distinguish molecular formulae from grouped or simplified formula options

Question 7

[Maximum number: 1]

The diagram shows the structure of a molecule of ethyl ethanoate.

Figure for Question 7 — CAIE IGCSE Chemistry

What is the molecular formula of a molecule of ethyl ethanoate?

A

CHO

B

C4H8O2\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{2}

C

C4(H2)2(O2)\mathrm{C}_{4}\left(\mathrm{H}_{2}\right)_{2}\left(\mathrm{O}_{2}\right)

D

C2H4O\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}