(a) Define Law of conservation of mass along with an
example.
(b) 15.9 g of copper sulphate and 10.6 g of sodium
carbonate were made to react with each other .
As a result, 14.2 g of sodium sulphate and 12.3 g
of copper carbonate were formed. Show that
these results are in accordance with the law of
conservation of mass.

Open in App

Solution

(a) The law of conservation of mass states that matter can neither be created nor be destroyed in a chemical reaction.

For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacts. So the mass of the product equals the mass of the reactant.

Copper sulphate + sodium carbonate → sodium sulphate + copper carbonate
$C U S O_{4} + N a_{2} C O_{3} \to N a S O_{4} + C u C O_{3}$
15.9g 10.6g 14.2g 12.3g
Total mass of reactants = 15.9g + 10.6g = 26.5g
Total mass of products = 14.2g + 12.3g = 26.5g
As there is no change in the mass of reactants and products, hence the law of conservation is obeyed.

Suggest Corrections

Similar questions

Q. 15.9 gram of copper sulphate and 10.6 g of sodium carbonate were made to react with each other. As a result 14.2 g of sodium sulphate and 12.3 g of copper carbonate were formed. This is in accordance with the _____________.

15.9 g

of copper sulphate and

10.6 g

of sodium carbonate react together to give

14.2 g

of sodium sulphate and

12.3 g

of copper carbonate. Which law of chemical combination is obeyed? How?

Q. Barium chloride reacts with sodium sulphate to form Barium sulphate and sodium chloride. Then, according to the law of conservation of mass:

Q. A student carries out the following reaction in the laboratory:

Sodium carbonate + Copper sulphate

\to

Copper carbonate + Sodium sulphate

How could you determine the reaction obeyed the law of conservation of mass?

Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium sulphate. In an experiment, 15.95 g of copper sulphate reacted with 8.0 g of sodium hydroxide to form 9.75 g of copper hydroxide and 14.2 g of sodium sulphate. Which law of chemical combination is illustrated by this data?

Join BYJU'S Learning Program