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

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

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Stoichiometry
An ideal gas can be liquified, because

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

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