Law of conservation of mass examples:
Matter can neither be created nor destroyed which is clear by Law of conservation of mass examples
2Mg ( 48g)+O2 (32g) = 2MgO(80g)
Mass of Mg 24×2=48g, O2 = 16×2=32g
It means in a chemical reaction the mass remains same.
CH4 (16g) + 2O2 (64g) = CO2 (44g) + 2H2O (36g)