The following data are obtained when dinitrogen and dioxygen react together to form different compounds :

Mass of dinitrogen	Mass of dioxygen
$$14\,g$$	$$16\,g$$
$$14\,g$$	$$32\,g$$
$$28\,g$$	$$32\,g$$
$$28\,g$$	$$96\,g$$

Which law of chemical combination is obeyed by the above experimental data ?

Solution :
According to the law of multiple proportions, "if two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers."
Fixing the mass of dinitrogen as $$28\,g,$$  masses of dioxygen combined will be 32, 64, 32 and 96 in the given figures. They are in the ratio of 1 : 2 : 1 : 3.