Explain why compounds with strong intermolecular attractive forces have higher b

Question

Explain why compounds with strong intermolecular attractive forces have higher boiling points then compounds with weak intermolecular attractive forces. Explain why ethylene glycol, the major component in antifreeze, HOCH_2CH_2OH has stronger attractive forces between its molecular than ethyl alcohol, CH_3CH_2OH, the alcohol in alcoholic beverages. On the basis of the rule "likes dissolve likes" explain why glycerol, CH_2(OH)CH(OH)CH_2(OH, is miscible in eater. Calculate the heat in kilojoules necessary to convert 55.0 g ethanol (ethyl alcohol, C_2H_5OH) from liquid to vapor. DeltaH_vap = 38 kJ/mol.

Explanation / Answer

Intermolecualr forces are the forces of attraction between the ions, molecules or the atoms.

As the polarity of the bond between the atoms increases, the strength of the intermolecular forces also increases. As a result, more energy is required to break the bond in the molecule. Hence, the boliling point of the compound increaes.

Therefore, compounds having strong molecular forces have high boiling point than the compounds with weak intermolecular forces that have low boiling points.

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