CourseCourseConceptConcept

CAIE IGCSE Chemistry 3.2.2 Relative Molecular Mass Mr As the Questions

Use a chemical formula to sum relative atomic masses, work backwards from a known relative mass, and distinguish molecules from ionic compounds.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • Calculate relative molecular or formula mass by summing atomic masses, including every atom in brackets.
  • deduce relative atomic mass from a compound formula
  • distinguish relative molecular and formula mass
  • Determine the atom count of a single-element molecule by dividing its relative molecular mass by the atomic mass.
  • Compare relative molecular masses of carbon-containing reactants and products in a stated reaction.

CAIE IGCSE Chemistry 3.2.2 Relative Molecular Mass Mr As the Questions question 1

[Maximum number: 1]

A compound of element X has the formula X2O\mathrm{X}_{2} \mathrm{O} and a relative formula mass of 144 .

What is element X ?

A

copper, Cu

B

gadolinium, Gd

C

sulfur, S

D

tellurium, Te

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