Question

state law of coservation of mass with scientist name?

Answer 1

Antoine Lavoisier, the scientist credited with the discovery of the law of conservation of mass. This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system.

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Answer 2

mass of sum of reactants is equal to mass of compound so formed
-antoine L lavoiser