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Relative formula mass

Relative formula mass

Relative formula mass, MrM_rMr​, is the sum of the relative atomic masses of every atom shown in a formula. A symbol without a subscript represents one atom, while a number outside brackets multiplies every atom inside them.

2.6 Calculations involving masses Lesson

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

Step-by-step lessons on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

Lessons