Relative masses of atoms and molecules

3.2

What the syllabus asks of you

Describe relative atomic mass, Ar, as the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of 12C
Define relative molecular mass, Mr, as the sum of the relative atomic masses. Relative formula mass, Mr, will be used for ionic compounds
Calculate reacting masses in simple proportions. Calculations will not involve the mole concept

Read the notes first

Chapter 3: Relative masses of atoms and molecules

Drill this topic

Every question on Relative masses of atoms and molecules, untimed, marked as you go.

Make a worksheet

Choose the years and how many questions, then print it with the answers on separate pages.