You need to fi nd the triple point of pure species A and are unable to fi nd its value in any reference books. You can fi nd the following data for A. It sublimes at 200 K and 0.1 bar, and it boils at 250 K and 1 bar.

(a) Calculate the temperature and pressure at the triple point. You may assume the enthalpies of sublimation and vaporization are constant. The values are:

(b) It turns out that the enthalpy changes are better represented in the following forms:

where A, B, C, and D are constants. Come up with an expression to fi nd T and P at the triple point with these forms.

Transcribed Image Text:

Ah subi = 13.921 kJ mol and Ahvap = 28.937 kJ mol