Question

State the law of conservation of mass

Answer 1

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed. Hence, the quantity of mass is conserved over time. 

Answer 2

mass of reactants will be equal to the mass of their products after the chemical reaction.mass can neither be created nor be destroyed