Moles and reacting masses

What the lesson covers

• Relative atomic mass and relative formula mass (C4.1)
• The mole and the Avogadro constant (C4.2)
• Moles from mass (C4.3)
• Percentage composition by mass (C4.4)
• Empirical and molecular formulae (C4.5)
• Reacting masses and limiting reactants (C4.6)
• Finding an equation from masses or gas volumes (C4.7)
• Self-check questions with answers (8)

Specification: C4.1-4.7. Codes follow the UAT-UK ESAT content specification.

How to use it

1. Read a section, then cover the worked example and try it yourself.
2. Check the common mistakes list: these are the slips the real test is built to catch.
3. Do the self-check without looking back. Mark it against the answers.
4. Then practise the topic under time, with the matching practice set.