Question

Law of conservation of mass and law of definite proportion examples 1 each

Answer 1

law of conservation of mass:  
                  barium chloride + sodium sulphate
law of constant propotion:     
                  in H2O the ratio of hydrogen and oxygen is 1:8

Answer 2

law of conversation of may states that in a chemical combination the mass of product is always equal to the mass of reactants.
law of constant proportion states that in a chemical combination the combination is always between the same element and their mass is always equal by same proportiin