A phase diagram is given below for some ficticious pure chemical substance, and

Question

A phase diagram is given below for some ficticious pure chemical substance, and can be used to answer the questions given below. Note that this substance has two different solid phases, and that the pressure axis is logarithmic. Which phase is more dense: s1 or s2? s2 or l? l or g? Justify your answer. How many triple points are there in the phase diagram? Where is each triple point located (T and p), and what three phases arc at equilibrium at each triple point? How many normal phase transition points are there in the phase diagram? Where is each of these points located (T and p), and what phase transition is occurring at each point? The temperature of 1.00 mol of the above substance is changed reversibly from 270. K. to 370. K, at a constant pressure p = 10.0 atm. Describe what happens as the process is carried out.

Explanation / Answer

b. 2

c. 4

4 phase changes

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