A Phase Diagram of a Pure Compound Has a Triple $\circ$

question 30

Multiple Choice

A phase diagram of a pure compound has a triple point at 22.0 ^$\circ$ C and 32 mm Hg,a normal melting point at 22.8 ^$\circ$ C,and a normal boiling point at 107 ^$\circ$ C.Which of the following statements regarding this compound is/are CORRECT?
1) The density of the liquid is greater than that of the solid.
2) Sublimation occurs if starting with a solid at a constant temperature of 25 ^$\circ$ C the pressure is decreased until a phase change occurs.
3) Condensation occurs if the temperature is decreased from 122 ^$\circ$ C to 75 ^$\circ$ C at a constant pressure of 1.00 atm.

• A) 1 only
• B) 2 only
• C) 3 only
• D) 1 and 2
• E) 1,2,and 3

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