Question

Water decomposes to O₂ and H₂ under suitable conditions as represented by the equation below:

\[\ce{2H2O -> 2H2 + O2}\]

If 2500 cm³ of H₂ is produced, what volume of O₂ is liberated at the same time and under the same conditions of temperature and pressure?

Answer 1

\[\ce{2H2O -> 2H2 + O2}\]

2 V               2 V     1 V

From equation, 2 V of water gives 2 V of H₂ and 1 V of O₂

where 2 V = 2500 cm³

so, volume of O₂ liberated = `(1 xx 2500)/2`

= 1250 cm³