The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 ... Each organism has a unique, relatively fixed, elemental formula, or composition determined by its form and function.

Relative formula masses can be calculated and used in conservation of mass calculations. Calculations can be carried out to find out concentrations of solution and uncertainties in measurements.

The mass of one substance in a reaction can be calculated if the masses of the other substances are known. For example: copper carbonate decomposes on heating to make solid copper oxide ...