Dinitrogen pentoxide can be made by the reaction of nitrogen with oxygen. consider the reaction
of 35g of nitrogen with 48 grams of oxygen. what is the maximum number of grams of dinitrogen pentoxide that can be made?

The only reactants are Nitrogen and Oxygen and the only product is dinitrogen pentoxide. Following the law of conservation of mass, the total amount of reactants must equal the total amount of products. Thus, the total mass of dinitrogen pentoxide:
35 + 48
= 83 grams