The van dar waals constant 'a' for `CO_(2)` and `CH_(4)` gases are 3.6 and 2.3 `L^(2)*atm*mol^(-2)`. Which one of these two gases can easily be liquefied?

The values of Vander waals constant a for the gases N_(2),CO_(2) and CH_(4) are 1.390, 3.640 and 2.2253L^(2) atm mol^(-2) respectively. The gas which can be most easily be liquified is,

(a) State Dalton's law of partial pressure. (b) The value of van der waals constant 'a' for N_(2) and NH_(3) are 1.37 and 4.30L^(2)*atm*mol^(-2) respectively. Explain the difference in values.

Given van der waals constant 'a' of 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-