Stoichiometry
The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements. This is the statement of

Trouton's rule
Law of Petit and Dulong
Nearnst heat theorem
Kopp's rule

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Stoichiometry
The heat capacity of a substance is

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

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