Question

The boiling point of water is higher than that the of petroleum. In which of to the intermolecular force are stronger?

Answer 1

hey...!!!

Petroleum Ether has non polar molecules whereas water has polar molecules.
The hydrogen bonding of a water molecule has least covalence with the oxygen of another water molecule.
Hence, water faces extra inter molecular attractions and requires more energy to change the state from liquid to vapor when compared to petroleum ether.

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Answer 2

Because water is polar. Each molecule is positive on one side and negative on the other. That means that the negative ends are attracted to the positive ends of the water around them, and vice versa. Think of a bucket of water as being like a bucket of little magnets: they all grab onto each other and clump together.

That means that, in order to vaporize water, the molecules have to be agitated enough to shake loose from that attraction and go free. That takes a significant amount of heat. That's why water is much less volatile than you'd expect of a molecule that small. Gasoline, on the other hand, is made of hydrocarbons that are generally non-polar, which means that they can break free more easily.