Stoichiometry
At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to

Increased collision rate among molecules
Increase in molecular attraction
Decrease in mean free path
Increase in average molecular speed

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Stoichiometry
The heat capacity of a substance is

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
Higher for solid state than for liquid state

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