How does molecular weight affect vapor pressure?

1 Answer
anor277
Jun 27, 2016

The vapour pressure of a solution is always lower than that of the pure solvent.

Explanation:

See this [site.](http://chemwiki.ucdavis.edu/Core/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Colligative_Properties/Vapor_Pressure_Lowering)

Given that vapor depression is a colligative property, dependent on the number of moles of solute in solution, solutes with lower molecular mass should cause less vapor pressure depression.

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