# Summary of session 7

1. The mole is used to quantify the number of atoms or formula units involved in a reaction or contained in a volume of gas or solution.
2. The mole is the amount of substance containing the number of particles equal to Avogadro’s constant, 6.02 x 1023.
3. To calculate quantities of reactants and products, it is essential to start with a balanced chemical equation that is viewed from a molar rather than a molecular perspective. The relative molecular mass values for the substances involved must be calculated and, from this information, the masses of the substances involved in the reaction can be determined.
4. Concentration is a measure of the amount of solute dissolved in a solution and is measured in mol dm-3.

OpenLearn - Discovering chemistry
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