A Certain Substance, X, Has a Triple-Point Temperature of 20°C

question 85

Multiple Choice

A certain substance, X, has a triple-point temperature of 20°C at a pressure of 2.0 atm. Which one of the following statements cannot possibly be true?

• A) X can exist as a liquid above 20°C.
• B) Both liquid and solid X have the same vapor pressure at 20°C.
• C) Liquid X can exist as a stable phase at 25°C, 1 atm.
• D) X can exist as a solid above 20°C.
• E) All of these statements could be true.

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