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

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

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Stoichiometry
An ideal gas can be liquified, because

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

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