Given van der Waals' constant for NH_3, H_2, O_2 " and " CO_2 " are respectively " 4.17, 0.244, 1.36 " and " 3.59, which one of the following gases is most easily liquefied?

Given van der Waals' constant for NH_3, H_2, O_2 " and " CO_2 " are re

1.	Given van der Waals' constant for NH_3, H_2, O_2 " and " CO_2 " are respectively " 4.17, 0.244, 1.36 " and " 3.59, which one of the following gases is most easily liquefied?
Answer» `NH_3` `H_2` `O_2` `CO_2` SOLUTION :`NH_3`