Question

A gas cylinder can hold 150 g of hydrogen under certain conditions of temperature and pressure. If an identical cylinder with the same capacity can hold 450 g of gas ‘G’ under the same conditions of temperature and pressure, find:

1. the vapour density of the gas ‘G’.
2. the molecular weight of gas ‘G’.

Answer 1

a. Relative vapour density = `"Mass of volume V of the gas under consideration"/"Mass of volume V of hydrogen gas under similar conditions"`

Vapour density of the gas ‘G’ = `450/150` = 3

b. The molecular weight = 2 × Relative vapour density

Molecular weight of gas ‘G’ = 2 × 3 = 6 g/mol