Question: When calculating the average specific heat of a mixture over a temperature range from the polynomial values, such as for toluene and ethanol, over what

When calculating the average specific heat of a mixture over a temperature range from the polynomial values, such as for toluene and ethanol, over what temperature range do we use the liquid vs the vapor specific heat? Is it liquid specific heat to the boiling point of the pure component and then vapor after that? Or is it to the bubble point of the mixture?

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