Q 6. 'Stability of a crystal is reflected in the magnitude of its
melting points'. Comment. Collect melting points of solid water, ethyl alcohol,
diethyl ether and methane from a data book. What can you say about the
intermolecular forces between these molecules?
Solution:–
Melting points of substances
Water = 273K
Ethyl alcohol = 155·7K
Diethyl ether = 156·8K
Methane = 90·5K.
The stability of crystals depends up
on the packing of the atoms. if there are strong force of attraction between
the constituent particles then greater the stability.
Water – strong intermolecular hydrogen bonding
Ethyl alcohol – strong intermolecular hydrogen
bonding.
Diethyl ether – it is a polar molecule so there is dipole
–dipole attraction
Methane – is
a non–polar molecule so that there is weak van der Waal's forces (London
dispersion forces).
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