Stoichiometry
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules

Do not lose energy on collision
Do work equal to loss in kinetic energy
Do not exert attractive force on each other
Are above the inversion temperature

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Stoichiometry
The heat capacity of a substance is

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

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