a french chemist who proved through experimentation that mass will be conserved in all chemical reactions if you consider both reactants and products
what is the law of conservation of mass?
in any given chemical reaction, the total mass of the reactants is equal to the total mass of the products
in order to give a completely accurate description of a chemical reaction, the equation must obey the laws of conservation of mass. this is shown by stating the amount of atoms on each side.