Question

the vapour density of oxygen at N.T.P. is 16. what will be the vapour density at 746K and 2 atmospheric pressure? a)8 b)32 c)16 d)4.​

Answer 1

The vapour density of oxygen at 746K and 2 atmospheric pressure is the same as that of the vapour density of oxygen at NTP , that is equal to 16.

• The vapour density of a gas is a relative measure of the molecular mass of the gas as compared to the molecular mass of hydrogen gas.
• Hence vapour density of a gas is the ratio of the molecular mass of the gas to that of hydrogen, so, vapour density of a gas is equal to half of its molecular mass.
• Vapour density of a gas is invariant of pressure and temperature, hence it always remains constant.