Question

The values of Vander Waals' constant $a$ for the gases $O_2,N_2,N{H}_3$ and $C{H}_4$ are $1.360,1.390,4.170$ and $2.253Latmmo{l}^{-2}$ respectively. The gas which can most easily be liquefied is:

• A. $O_2$
• B. $N_2$
• C. $N{H}_3$
• D. $C{H}_4$

Answer 1

The correct option is C $N{H}_3$

The 'a' values for a given gas are a measure of intermolecular forces of attraction. More are the intermolecular forces of attraction, more will be the value of a.

Greater the value of van der Waals' constant a, more easily liquefiable is the real gas. So ammonia can be easily liquefied as its van der Waals constant (4.17) has the highest value among all.