Which of these statements is NOT a necessary assumption in the derivation of the Clausius-Clapyeron equation?
A. The heat of vaporization is constant.
B. Temperature must be expressed in kelvin.
C. The molar volume of the liquid phase is essentially zero compared to the molar volume of the vapor phase.
D. The vapor phase can be considered an ideal gas.
E. All of the above are necessary in the derivation and/or use of the equation.
A. Incorrect. This is a very important assumption used to simplify the equation.
B. Correct. Tricky! There are other absolute temperature scales in existence, though the one named after Kelvin is the most common.
C. Incorrect. This is used to remove the VL variable from the Clausius equation.
D. Incorrect. This is a necessary assumption in the derivation of the equation.
E. Incorrect. One is not, but you will have to look closely to pick up on it.
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