Phase Transitions of a Substance at Different Pressures and Temperatures

What phase transition would occur if a quantity of the substance at 1.5 atm and 800°C was cooled to 700°C?

At what pressure and temperature does the substance exist in the liquid phase?

If the substance at 0.75 atm and 100°C was cooled to 50°C, what phase transition would occur?

What phase would the substance be in at 2.0 atm and 90°C?

At what pressure and temperature would all three phases (solid, liquid, gas) coexist for this substance?

If a quantity of this substance at 0.5 atm and 300°C was rapidly heated to 600°C, what phase transition(s) would occur?

At what pressure and temperature would this substance exhibit the highest density?

If a quantity of this substance was at an initial pressure of 0.25 atm and temperature of -100°C was heated to 200°C, what phase transition(s) would occur?

What phase (solid, liquid, gas) would a substance be in at 1 atm and -100°C?

If a quantity of this substance was at an initial pressure of 1.5 atm and temperature of 800°C was cooled to 700°C, what phase transition(s) would occur?