Question

If the weight of 5.6 litres of a gas at N.T.P. is 11 gram. The gas may be :

• A. $P{H}_3$
• B. $COC{l}_2$
• C. $NO$
• D. $N_{2}O$

Answer 1

The correct option is D $N_{2}O$

1 mole of a gas at N.T.P occupies 22.4 L. Its weight is M which is equal to its molecular weight.
5.6 L of a gas at N.T.P weighs 11 g.

Thus $\frac{5.6}{22.4}=\frac{11}{M}$.

Hence, the molecular weight is 44 g/mol.

The gas is $N_{2}O$ as its molecular weight is 44 g/mol.