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CAIE IGCSE Chemistry: Empirical Formula Definition Question Bank

Practise reducing molecular formulae to empirical formulae for acids, esters, polymers and hydrocarbons using atom ratios.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • select the compound or polymer repeat unit that matches a given empirical formula

3.1.5—Empirical formula of a compound as the question 1

[Maximum number: 1]

Five organic compounds have the following structures.
A
C
C
A
,

Figure for Question 3.1.5—Empirical formula of a compound as the question 1 — CAIE IGCSE Chemistry

B
B

Figure for Question 3.1.5—Empirical formula of a compound as the question 1 — CAIE IGCSE Chemistry
Figure for Question 3.1.5—Empirical formula of a compound as the question 1 — CAIE IGCSE Chemistry
Figure for Question 3.1.5—Empirical formula of a compound as the question 1 — CAIE IGCSE Chemistry

D

Figure for Question 3.1.5—Empirical formula of a compound as the question 1 — CAIE IGCSE Chemistry

E

Figure for Question 3.1.5—Empirical formula of a compound as the question 1 — CAIE IGCSE Chemistry

Which compound has the empirical formula C2H5\mathrm{C}_{2} \mathrm{H}_{5} ?

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