Using the phase diagram in Example 11.4, sketch the heating curves expected at pressures of

(a) 1 atm and

(b) 0.2 atm.
Strategy

Follow the proper horizontal line in the phase diagram to determine what phases occur as heat is added to the sample.

Example 11.4

Using the phase diagram to the left, identify the phase or phases present at each of the lettered points A, C, and E.
Strategy

Determine which phase exists in each region of the phase diagram. If a point falls on a line between two phases, both of those phases exist in equilibrium. If a point lies at the point where all three phases intersect, all three phases are in equilibrium under these conditions.