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Question

) How does boiling point and melting point of hydrocarbons change with increase in molecular mass? 


Solution

Boiling point and melting point of hydrocarbon is directly related with molecular mass.  This is because the Vandar Walls force between the molecules will increase with increase in molar mass.  The following examples will illustrate the theory.
Methane - Molar mass 16u - gas with less melting and boiling point
Butane - Molar mass 58u- Gas that can be liquified and stored as LPG
Petrol (Octane)- Molar mass - 114u - Liquid at room temperature which will easily evaporate
Higher hydrocarbons like Diesal, Kerosene - Liquid at room temperature with relatively high boiling point
Further among the hydrocarbons with same molar mass, the linear hydrocarbons will have more boiling point due to symmetry and can be packed effectively.
So among butane and isobutane, n-butane will have high boiling point.
 

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