Answer the following statement(s) true (T) or false (F)
A. The excess molar enthalpy is equal to the solution molar enthalpy minus the solution molar enthalpy if the solution was modeled as an ideal solution.
B. A mixture of ethanol and ethane would behave as an ideal solution since they both have two carbon atoms and have similar sizes.
C. Mole fraction and mass fraction are always the same.
D. When the excess enthalpy for a system is positive, the mixing process is exothermic.
E. None of the above are true.
A. Correct. This is the definition of excess molar enthalpy.
B. Incorrect. Mixture properties are heavily dependent on the polarity and functionality of the compounds. Ethanol has a polar hydroxyl functional group while ethane is nonpolar.
C. Incorrect. This would only be true if the molecular weights of all substances in the mixture are the same.
D. Incorrect. When the excess enthalpy for a system is positive, the mixing process is endothermic.
E. Incorrect. One of them is correct.
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