Boiling point

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1.Why does boiling point depend on weight ?
2.Does the vanderwall force depend on weight ?
 

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Ygggdrasil
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1. Because dispersion forces (a type of van der Waals force) depend on molecular size.

2. Dispersion forces (also known as induced dipole-induced dipole interactions) depend on the polarizability of the molecule (how easy it is to get an asymmetric distribution of electron in a molecule). As the number of electrons in a molecule and the size of the molecule increases, the polarizability increases.
 

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