Which is greater, the mass of the compounds before a chemical reaction or the mass of the compounds after a chemical reaction?

Question

cail · Answer

Molar mass, symbol M, is a physical property characteristic of a given substance (chemical element or chemical compound), namely its mass per amount of substance.The base SI unit for mass is the kilogram and that for amount of substance is the mole. It would depend on what chemicals and what reaction was taking place to determine the end mass.