GCSE Chemistry Equations: Formulas and Calculators
The key GCSE chemistry calculations in one place: relative formula mass, moles, the Avogadro constant, percentage by mass and concentration in g/dm³ and mol/dm³. Type a formula or enter the values in any units and get a step-by-step solution.
Moles and mass
Solutions
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Chemistry equations: frequently asked questions
Most are in quantitative chemistry: moles = mass ÷ Mr, concentration = mass ÷ volume (g/dm³) and percentage by mass = (Ar × number of atoms) ÷ Mr × 100. Higher tier adds number of particles = moles × 6.02 × 10²³, gas volume = moles × 24 dm³ at RTP and concentration in mol/dm³. Your exam board's specification has the full list.
No. You get a periodic table with relative atomic masses, but formulas such as moles = mass ÷ Mr must be learnt. Constants such as the Avogadro constant and the molar gas volume are usually given in the question.
Yes. Every calculator works in the browser on a phone, tablet or computer, with no sign-up and no limit on how many problems you solve.
The values from the GCSE periodic table: whole numbers for most elements, with Cl = 35.5 and Cu = 63.5. That way your answers match the mark scheme.