The stability of a crystal is reflected in the magnitude of its melting point”. Comment. Collect the value of melting point of water, ethyl alcohol, diethylether and methane from the data given in the book. What can you say about the inter molecular forces between these molecules?

The stability of a crystal is reflected in the magnitude of its meltin

1.	The stability of a crystal is reflected in the magnitude of its melting point”. Comment. Collect the value of melting point of water, ethyl alcohol, diethylether and methane from the data given in the book. What can you say about the inter molecular forces between these molecules?
Answer» Higher the melting points, greater will be the forces of attraction between the molecules or constituent particles and hence greater will be the stability. The melting points of given compounds are as follows. Water = 273 K Ethyl alcohol = 155.7 K Diethyl ether = 156.7K Methane = 90.5 K The inter molecular forces of attraction between the molecules of water and ethyl alcohol are mainly due to hydrogen bonding. The melting point of water is higher than ethyl alcohol shows that hydrogen bonding in ethyl alcohol molecules is not as strong as in water molecules. Diethyl ether is a polar molecule. The inter molecular forces present in them are dipole-dipole interactions Methane is a non-polar molecule. The only forces present in them are the weak vander waals forces i.e., London dispersion forces.

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The stability of a crystal is reflected in the magnitude of its melting point”. Comment. Collect the value of melting point of water, ethyl alcohol, diethylether and methane from the data given in the book. What can you say about the inter molecular forces between these molecules?

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