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CAIE A-Level Chemistry AS 2.3.5 Empirical and Molecular Formulas Questions

Practise calculating empirical and molecular formulae from combustion results, percentages, masses, isotope data and relative molecular masses.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Calculate empirical and molecular formulae from composition, combustion, mass, percentage and relative molecular-mass data.

CAIE A-Level Chemistry AS 2.3.5 Empirical and Molecular Formulas Questions question 1

[Maximum number: 1]

Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate. All the water of crystallisation is lost to the atmosphere as steam.

When 3.10 g of hydrated cobalt(II) sulfate, CoSO4⋅×H2O\mathrm{CoSO}_{4} \cdot \times \mathrm{H}_{2} \mathrm{O}, is heated to constant mass the loss in mass is 1.39 g .

What is the value of x, to the nearest whole number?

A

4

B

6

C

7

D

11

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