A phase diagram of a pure compound has a triple point at 18 °C and 72 mm Hg, a n

Question

A phase diagram of a pure compound has a triple point at 18 °C and 72 mm Hg, a normal melting point at 21 °C, and a normal boiling point at 87 °C. Which of the following statements regarding this compound is/are CORRECT?

1.The density of the solid is greater than that of the liquid.

2.Sublimation occurs if starting with a solid at a constant temperature of 17 °C the pressure is decreased until a phase change occurs.

3.Condensation occurs if the temperature is decreased from 55 °C to 13 °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

Explanation / Answer

answer : d) 1 and 2

Explanation :

solid has high density than a liquid.

sublimation is converting solid into directly gas.

condensation means converting gas to liquid. but in the above statement 55 to 13 temperature decreases then it goes to directly into solid phase.so this one is wrong

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