Question

In a reaction, 10 g of calcium carbonate reacts with 7.3 g of hydrochloric acid. The products of reaction
are 11.1 g of calcium chloride, 1.8 g of water and 4.4 g of carbon dioxide gas. Show that these
observations are in agreement with the law of conservation of mass.​

Answer 1

Answer:

We know,

Law of conservation of mass states that mass can neither br created nor destroyed. Therefore, the mass of products is equal to the mass of reactants.

In the given reaction,

Mass of reactants = 10 g + 7.3 g = 17.3 g

Mass of products = 11.1 g + 1.8 g + 4.4 g = 17.3 g

Since, the mass of reactants and products are equal, thus the given reaction is in agreement with the law of conservation of mass.

Answer 2

Solution :

Sodium carbonate + acetic acid → Sodium acetate + carbon dioxide + water

5.3g 6g 8.2g 2.2g 0.9g

As per the law of conservation of mass, the total mass of reactants must be equal to the total mass of products

As per the above reaction, LHS = RHS i.e., 5.3g + 6g = 2.2g + 0.9 g + 8.2 g = 11.3 g