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

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

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Stoichiometry
The heat capacity of a substance is

Higher for solid state than for liquid state
Lower for liquid state than for gaseous state
Equal for solid and liquid states below melting point
Greater for liquid state than for solid state

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