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CAIE A-Level Chemistry AS 13.1.6 The Molecular and or Empirical Formula Questions

Practise counting atoms in structural, displayed and skeletal formulae and reducing molecular ratios to empirical formulae.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Deduce molecular formulae by counting each atom in a structural, displayed or skeletal formula.
  • Reduce molecular formulae to empirical formulae using the greatest common divisor of the element subscripts.
  • Use skeletal-formula connectivity and implicit carbon/hydrogen conventions to check formulae for organic molecules and ions.

CAIE A-Level Chemistry AS 13.1.6 The Molecular and or Empirical Formula Questions question 1

[Maximum number: 1]

The diagram shows the skeletal formula of citric acid.

citric acid

citric acid

What is the molecular formula of citric acid?

A

C6H8O7\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{7}

B

C6H4O7\mathrm{C}_{6} \mathrm{H}_{4} \mathrm{O}_{7}

C

C8H8O7\mathrm{C}_{8} \mathrm{H}_{8} \mathrm{O}_{7}

D

C10H8O7\mathrm{C}_{10} \mathrm{H}_{8} \mathrm{O}_{7}

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