Question

What do you understand of the statement ‘ The vapour density of carbon dioxide is 22’? Atomic weight of chlorine is 35.5. what is its vapour density (Mass of $\mathrm{Cl}=35.5$)

Answer 1

Vapour density of a gas is the ratio of mass of a certain volume of gas or vapour to the mass of the same volume of hydrogen under the same temperature and pressure

Molecular weight of the gas = Vapour density of gas x 2

The Vapour density of carbon dioxide is 22 : It means that mass of x litres of hydrogen gas or the molecular mass of ${\mathrm{CO}}_{2_{}}$is 44g.

Atomic weight of chlorine $\mathrm{Cl}$ = 35.5 g

Molecular mass of ${\mathrm{Cl}}_2$= $35.5\times 2$

Molecular mass of ${\mathrm{Cl}}_2$ is 71g

$\begin{array}{rcl}Vapourdensity{\mathrm{Cl}}_{2}of& =& \frac{Molecularmassof{\mathrm{Cl}}_2}{2}\\ & =& \frac{71}{2}\\ & =& 35.5\\ & & \end{array}$