Physical propoerties and intermolecular forces what type of, Ask an Expert

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Physical propoerties and intermolecular forces
What type of intermolecular forces accounts for the following differences in each case?
CH3OH boils at 65oC, but CH3SH boils at 6oC.
Xe is a liquid at atmospheric pressure and 120 K, whereas Ar is a gas.
Kr, atomic weight 84, boils at 120.9 K, whereas Cl2, MW ? 71, boils at 238 K.
Acetone boils at 56oC, whereas 2-methylpropane boils at - 12oC.

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