nitrogen forms five compounds with oxygen in which 2.5g of nitrogen combines with 1.43,2.85,4.33,5.70 and 7.13g of oxygen respectively. show that these figures agree with law of multiple proportion

It’s b. mass i searched it up

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).