A13.0g sample of x combines with a 34.0-g sample of y to form the compound xy2 compound xy2 what is the mass of the recent

The mass of the product would be equal to the sum of the masses of the reactants given there is only one product. The mass would be 47.0 g XY2 product. This is in accordance with the law of conservation of mass where it states that mass cannot be created or destroyed. So, in a certain process, what mass goes in should be equal to the mass that goes out whether a reaction or a physical process is happening in the process. This is also applicable for chemical reactions. The mass of the product should be equal to the mass of the reactants.

The answer is c) pyrite