Question

State the Gay Lussac’s law of combining volumes. Explain with an illustration.

Answer 1

Whenever gases react together, the volumes of the reacting gases and the products bear a simple whole number ratio, provided all the volumes are measured under similar conditions of temperature and pressure.
Steps:

1. Hydrogen combines with oxygen to form water 
2. H₂ + `1/2`O₂ → H₂ O (Skeletal eqution)
3. 2H₂ + O_2(g)  → 2H₂O_2(g) (Balanced equation)

(2 volumes) + (1 volumes) ( 2volumes)

2:1:2

Two volumes of hydrogen react with one volume of oxygen to form two volumes of water vapour that is the ratio by volume, which gases bears is
2:1:2, which is a simple whole number ratio.