Question

Choose the statements that correctly describe the following phase diagram

a. If the temperature is raised from 50K to 400K at a pressure of 1atm, the substance boils at approximately 185k.

b. The liquid phase of this substance cannot exist under conditions of 2atm at any temperature.

c. The triple point occurs at approximately 165K.

d. At a pressure of 1.5 atm the melting point of the substance is approximately 370 K.

e. The critical point occurs at approximately 1.7 atm and 410 K.

Short answer

The statements that correctly define the following phase diagrams are c and e.

Step-by-step solution

Analyzing the correct statements c and e

c is true. The triple point on the phase diagram is where lines of equilibrium intersect; there is only one, at approximately 165K.

e is true. On the diagram on the right, the phase boundary between liquid and gas does not continue indefinitely. Instead, it terminates at a point on the phase diagram called the critical point.

Analyzing the incorrect statements in regard to the given question

The statement (a) is false because the water will boil at approximately 265K, which is where the equilibrium line between liquid and gaseous state intersects the pressure line of 1atm.

The statement (b) is false. The line marking the pressure of 2atm goes through the liquid phase area.

The statement (d) is false because the water will melt at approximately 240K, which is where the equilibrium line between solid and liquid state intersects the pressure line of 1.5 atm.