Stoichiometry
The heat capacity of a substance is

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

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Stoichiometry
A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container

Can not be determined
Will be 298 K
Will be less than 298 K
Will be greater than 298 K

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