The Law of Conservation of Mass

• Established in 1789 by French Chemist Antoine Lavoisier

• States that mass is neither created nor destroyed in any ordinary chemical reaction.

• Or more simply, the mass of substances produced (products) by a chemical reaction is always equal to the mass of the reacting substances (reactants).

E.g., 1.00g carbon + 5.34g sulphur ? 6.34g carbon disulphide

and

2.00g carbon + 10.68g sulphur ? 12.68g carbon disulphide

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