Stoichiometry
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the

Molal latent heat of vaporisation is constant within the limited temperature range
Volume in the liquid state is negligible compared with that in the vapor state
All of these
Vapor follows the ideal gas law

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Stoichiometry
An ideal gas can be liquified, because

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

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