Question

Deduce the relationship between molecular mass and vapour density

Answer 1

Answer:

It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapour density = mass of n molecules of gas / mass of n molecules of hydrogen. (and thus: molar mass = ~2 × vapour density) For example, vapour density of mixture of NO2 and N2O4 is 38.

Answer 2

Answer:

• vapour density = mass of particular gas ÷ mass of hydrogen

• density = mass / volume
• v.d = m of gas / v of gas ÷ m of h / v of h
• according to avagadros law here temp and pressure are in fixed quantity
• hence , volumes can be cut
• v.d = m of gas / m of h
• v.d = m of molecule of gas / m of molecule of h
• v.d = m of 1 molecule of gas / m of 1 molecule of h
• v.d = m.m / 2
• m.m = 2 x v.d