Question

law of conservation of mass

Answer 1

The law of conservation of massstates that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants

Answer 2

Law of conservation of mass: -

❁✿The law was fIrst stated by Lavoisier in 1774.

❁✿It is also known as the law of indestructibility of matter.

❁✿According to this law, in all chemical changes, the total mass Of a system remains constant or in a chemical change, mass is neither created nor destroyed.

❁✿All chemical reactions follow this law. Thus, this law is the basis of all quantitative work in chemistry.

Example:

1.70 g of silver nitrate dissolved in 100 g of water is taken. 0.585 g of sodium chloride dissolved in 100g of water is added to it and chemical reaction occurs. 1.435 g of silver chloride and 0.85 g of sodium nitrate are formed.

Solution:

Total masses before chemical change

=Mass of AgN03 + Mass ofNaCI + Mass of water

=1.70g + 0.585g + 200.0g

= 202.285 g

Total masses after the chemical reaction,

= Mass of AgCl + Mass of NaN03 + Mass of water

=1.435 g + 0.85 g_+ 200.0 g

= 202.285g·

Thus, in this chemical change,

Total masses of reactants = total masses of products

❁✿This relationship holds good when reactants are completely converted into products. In case, the reacting materials are not completely consumed,

the relationship will be

Total masses of reactants

= Total masses of products + Masses of unreacted reactants

Thank You ❤

@swigy