g what is the law of definite proportions? all compounds have equal amounts of each element that composes them. each sample of a given compound has the same ratios of the masses of the elements that compose it. all compounds have half as much of one element as they do of the other element in the compound. in any given compound, the ratio of the number of atoms of can vary from molecule to molecule. in any given compound, the ratios of the mass of the elements can vary widely.
