Stoichiometry
The heats of vaporisation of CS₂, C₂H₅OH &H₂O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is

CS₂ > H₂O > C₂H₅OH
H₂O > CS₂ > C₂H₅OH
H₂O > C₂H₅OH > CS₂
CS₂ > C₂H₅OH > H₂O

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Stoichiometry
An ideal gas can be liquified, because

Forces operative between its molecules are negligible
It gets solidified directly without becoming liquid
Its critical temperature is more than 0°C
Its molecular size is very small

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