Stoichiometry
Applicability of Claussius-Clapeyron equation is subject to the condition that the

Both A & B
Volume in the liquid state is negligible
Neither A nor B
Vapor follows ideal gas law

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Stoichiometry
An ideal gas can be liquified, because

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

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