Question

A gaseous mixture of $H_2$ and $C{O}_2$ gas contains $66$ mass $\%$ of $C{O}_2$ . The vapour density of the mixture is

• A. $6.1$
• B. $5.4$
• C. $2.7$
• D. $10.8$

Answer 1

The correct option is C $2.7$

$\text{Number of moles of}C{O}_2\text{in}100\text{g mixture}$
$=\frac{66}{44}=1.5$
$\text{Number of moles of}{H}_2\text{in 100 g mixture}$
$=\frac{34}{2}=17M_{average}=\frac{100}{18.5}=5.40\text{Vapour Density}=\frac{5.4}{2}=2.7$