Question

The mass of the products equals the mass of the reactants in a chemical reaction.Give an example to prove it.

Answer 1

this is bcoz to be abide by the law of conservation of mass
one example is
2h2+o2------------:2h2o
electrolysis

Answer 2

This was proved by the law of conservation of mass which means the mass of products is equal to mass reactants
For example-
H2 + O=H2O