A pure sample of benzene (C6H6) melts sharply at 5.5 °C, while a pure sample of hexafluorobenzene (C — States of Matter Chemistry Question
Question
A pure sample of benzene (C6H6) melts sharply at 5.5 °C, while a pure sample of hexafluorobenzene (C6F6) melts sharply at 5.2 °C. However, an equimolar mixture of C6H6 and C6F6 melts sharply at 23.7 °C. Which is the best explanation for this observation?
A.
C6H6 and C6F6 are immiscible in the liquid phase.
B.✓ Correct
C6H6 and C6F6 form a crystal containing equal amounts of the two substances.
C.
Fluorocarbons characteristically show negative freezing point depression constants.
D.
The enthalpy of mixing of C6H6 and C6F6 is negative.
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