Question

State law of conservation of mass.

Answer 1

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.

Answer 2

The Law of Conservation of mass was given by Antoine Lavoisier.

The law states that
" Mass can neither be created nor be destroyed in a chemical reaction"

In a chemical reaction the total mass of reactants and products is always equal.

It is also called law of indestructibility of matter.