Question

2.5 ml of a gaseous hydrocarbon exactly requires 12.5 ml oxygen for complete combustion and produces 7.5 ml carbon dioxide and 10.0 ml water vapour. All the volumes are measured at the same pressure and temperature. Show that the data illustrates Gay Lussac’s law of volume combination.

Answer 1

V_hydrocarbon : V_oxygen : V_{carbon dioxide} : V_{wa ter vapour} = 2.5 : 12.5 : 7.5 : 10.0

= 1 : 5 : 3 : 4 (simple ratio)

Hence, the data is according to the law of volume combination.