Skip to content
BvunzoHub

Menu

Get full accessSign in

Cambridge AS & A Level Chemistry

2.1Relative masses of atoms and molecules

Relative masses of atoms and molecules in Cambridge AS & A Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic24 practice questions1 lesson
Practise this topicAll Chemistry topics

Learning objectives

What the syllabus expects you to be able to do.

  1. 2.1.1Define the unified atomic mass unit as one twelfth of the mass of a carbon-12 atom.
  2. 2.1.2Define relative atomic, isotopic, molecular and formula mass using the unified atomic mass unit.

Lessons

  • Relative masses, the mole and the Avogadro constant

    35 min

    Full access

Join to read every lesson, or see what Full access includes.

Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Relative masses of atoms and molecules: sample question

1 mark

A sample of gallium contains 60.1% gallium-69 and 39.9% gallium-71. What is the relative atomic mass of gallium in this sample?

Choose one answer

Turn Relative masses of atoms and molecules into a strength.

Practise with instant marking, see your mastery grow and get a study plan built around your exam date.

Start learningChemistry topics