Stoichiometry
An equation for calculating vapour pressure is given by, log10 P = A - B(t + c).

Trouton's rule
Antonic equation
Kopp's rule
Kistyakowsky equation

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Stoichiometry
An ideal gas can be liquified, because

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

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