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Chemistry Formulae
  General Chemistry Formulae


Atomic Mass: Atomic mass of an element is the number of protons + the number of electrons.

Weight of 1Mol of an element (in grams) is equal to the atomic mass.

Moles, General Chemistry formulae, Eformulae.com

In an equation, the mass of the reactants is equal to the mass of the products.

Mass of reactants, General Chemistry formulae, Eformulae.com

Percentage Composition, General Chemistry formulae, Eformulae.com

To calculate an Empirical Formula

  • Write the percentages (or masses) under the symbols.

  • Divide the percentages (or masses) by the atomic mass.

  • Divide the smallest number to get a simple ratio.

  • Write the numbers to the bottom-right of each element, to get a formula.

Empirical Formula, General Chemistry formulae, Eformulae.com

  • One mole of any gas occupies 24dm3(24l) at room temperature and pressure.

  • Formulae are made up of different elements expressed as symbols.

  • The bottom-right hand number is a formula, is the number of atoms of that element.



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