Question

500 ml of a gas x at stp weight 0.50 crime calculate the vapour density and molecular weight of the gas

Answer 1

Density = mass / volume

We convert the ml to cm³

1ml = 1cm³

500 × 1cm³ = 500 cm³

Density = 0.5/500 = 0.001 g/cm³

The molar gas volume at stp is :

22400cm³ = 1 mole

Moles in 500 cm³ are :

500/22400 = 0.02232 moles

Moles = mass / molar mass

Molar mass = mass / moles

= 0.5 / 0.02232 = 22.40