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CAIE IGCSE Chemistry 3.1.2 Molecular Formula of a Compound As the Questions

Deduce molecular formulae by reading structures and counting each element in the compound.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • deduce molecular formulae from structural information
  • count atoms represented by chemical formulae
  • compare atom ratios in compound formulae
  • interpret formulae of organic and inorganic compounds
  • calculate molecular formula from a displayed structure

CAIE IGCSE Chemistry 3.1.2 Molecular Formula of a Compound As the Questions question 1

[Maximum number: 1]

Caffeine is a stimulant found in coffee.

Figure for Question CAIE IGCSE Chemistry 3.1.2 Molecular Formula of a Compound As the Questions question 1 — CAIE IGCSE Chemistry

caffeine

Which formula represents caffeine?

A

C7H10 N4O2\mathrm{C}_{7} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

B

C8H10 N3O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{3} \mathrm{O}_{2}

C

C8H10 N4O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

D

C8H11 N4O2\mathrm{C}_{8} \mathrm{H}_{11} \mathrm{~N}_{4} \mathrm{O}_{2}

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