Question

which of the following cannot be determined by looking at the phase diagram? A. melting point, B. boiling point, C. subilmation point D. system pressure.

Answer 1

One of the axes of a phase diagram is pressure. Hence pressure itself isn't specified.

Very importantly, a phase diagram tells you exactly where, for different pressures and temperature, a substance goes through all of its phase transitions:
- solid/liquid (freezing/melting)
- liquid/gas (condensing/boiling)
- solid/gas (sublimation)

Answer 2

D. everything else is part of the phase diagram :)