Stoichiometry
Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

None of these
Heat conservation
Yield enhancement
Product enrichment

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Stoichiometry
The heat capacity of a substance is

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

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