CO2 because the heaviest would have the most attraction ,although the deviation is little since all have london dispersion forces between then CH4 is larger but nonpolar, hence there will be little intermolecluar attraction. N2 is a smaller molecule,hence doesnt have much attraction Solution CO2 because the heaviest would have the most attraction ,although the deviation is little since all have london dispersion forces between then CH4 is larger but nonpolar, hence there will be little intermolecluar attraction. N2 is a smaller molecule,hence doesnt have much attraction.