Question

Which of the following is a suitable example for illustrating the law of conservation of mass?

(Atomic mass of O = 16; H = 1)

• A. 18g of water is formed by the combination of 16g oxygen with 2g of hydrogen.
• B. 18g of water in liquid state is obtained by heating 18g of ice.
• C. 18g of water is completely converted into vapour state on heating.
• D. 18g of water freezes at $4^{\circ }C$ to give same mass of ice.

Answer 1

The correct option is A

18g of water is formed by the combination of 16g oxygen with 2g of hydrogen.

$H_2+\frac{1}{2}{O}_2\to H_{2}O\left[Lawofconservationofmassisvalidforchemicalchangeonly\right].2gm16gm18gm$