Question

5.6 litre of a gas at STP are found to have a mass of 22 g. The molecular mass of the gas is :

• A. 22 g
• B. 44 g
• C. 88 g
• D. 33 g

Answer 1

The correct option is C 88 g

$1mole$ gas occupies $22.4L$ of volume at STP.

$\therefore 5.6litreofgas=\frac{22.4}{5.6}moles$

$⟹5.6litreofgas$ indicates $0.25moles$ of gas.

Given that,

$0.25moles$ of gas weights $22g$.

$⟹1mole$ of gas weight $22\times 4=88g$

Hence, molecular weight of gas $88g.$