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________________?
Correct answer: D. H2O > C2H5OH > CS2
- A. CS2 > H2O > C2H5OH
- B. CS2 > C2H5OH > H2O
- C. H2O > CS2 > C2H5OH
- D. H2O > C2H5OH > CS2
Explanation
A larger heat of vaporisation generally indicates stronger intermolecular attraction because more energy is needed to separate the molecules. The values give H₂O (40.6) > C₂H₅OH (38.6) > CS₂ (26.8).
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