Question

Assuming ideal gas behaviour, the ratio of density of ammonia to that of hydrogen chloride at same temperature and pressure is : (Atomic wt. of $Cl=35.5u$)

• A. 1.46
• B. 0.46
• C. 1.64
• D. 0.64

Answer 1

Answer: (B)

We have $M=\frac{\rho RT}{p}$...(1)

where $\rho$ is the density of the gas in gram per litre, $M$ is the molar mass, $R$ is the universal gas constant, $T$ is the temperature and $p$ is the pressure.

If temperature and pressure are constant, then $\rho \propto M$

$\frac{{\rho }_{N{H}_3}}{{\rho }_{HCI}}=\frac{M_{N{H}_3}}{M_{HCl}}=\frac{17}{36.5}=0.46$