Question

(a) What do you understand by the statement that ‘Vapour Density of carbon dioxide is 22’.

(b) Atomic weight of chlorine is 35.5. What is its vapour density?

Answer 1

(a) ‘Vapour Density of carbon dioxide is $22$’:

• Vapour density is the density of gas with respect to hydrogen gas.
• It can be defined as mass of certain quantity of a substance is divided by mass of same quantity of hydrogen.
• That way the mass of ${\mathrm{CO}}_2$ fuel line is $22$ instances heavier than that of hydrogen.

(b) Atomic weight of chlorine$=35.5$

• The molecular weight of chlorine (${\mathrm{Cl}}_2$)$=35.5\times 2$

$=71$

• Vapour density of chlorine=$\frac{Molecularwt.}{2}$

$=\frac{71}{2}=35.5$

• The vapour density of chlorine is $35.5$.