5g of calcium carbonate on complete decomposition gives off 2.2 g of carbon dioxide gas and X g of calcium oxide . calculate X . which law do you apply for the above calculation

5g of calcium carbonate on complete decomposition gives off 2.2 g of c

1.	5g of calcium carbonate on complete decomposition gives off 2.2 g of carbon dioxide gas and X g of calcium oxide . calculate X . which law do you apply for the above calculation
Answer» E Law of Conservation of mass, the REACTANTS and the products have to be in equal amount.hence, Reactant is 5ggiving 2.2 g + X GFROM the law of conservation of mass5g = 2.2 + XX = 5 - 2.2X = 2.8 g