Stoichiometry
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

The attractive forces between like and unlike molecules are almost equal
In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The component molecules are non polar and are of almost equal size
No component is concentrated at the surface of the solution

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Stoichiometry
An ideal gas can be liquified, because

Its molecular size is very small
Its critical temperature is more than 0°C
It gets solidified directly without becoming liquid
Forces operative between its molecules are negligible

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