Question

'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?

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Answer 1

Answer:

• 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).