State law of conservation of mass.
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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.
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.