Question

1.7 g of silver nitrate dissolved in 100 g of water is taken. 0.585 g of sodium chloride dissolved in 100 g 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. Justify that the data obey law of conservation of mass.

Answer 1

Total mass before the chemical change

= mass of AgNO3 + mass of NaCl + mass of water

= 1.7 + 0.585 + 200

= 202.285 g

Total mass after the chemical reaction

= mass of AgCl + mass of NaNO3 + mass of water

= 1.435 + 0.85 + 200

= 202.285 g

Thus total mass before reaction = total mass after reaction. This confirms the law of conservation of mass.