Shown here is the phase diagram for compound Z. The triple point of Z is €“5.1°C at 3.3 atm and the critical point is 51°C and 99.1 atm.

a. What is the state of Z at position A?
b. If we increase the temperature from the compound at position A to 60°C while holding the pressure constant, what is the state of Z?
c. If we take the compound starting under the conditions of part b and reduce the temperature to 20°C and increase the pressure to 65 atm, what is the state of Z?
d. Would it be possible to make the compound starting under the conditions of part c a solid by increasing just the pressure?

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Temperature (°C) →