1) Where in the phase diagram of a compound do all phases exist together?
a) at the sublimation point
b) at the boiling point
c) at the melting point
d) at the critical point
e) at the triple point
I chose answer E, the triple point.
Is this correct?
I agree. By the way, I looked at the 2CH4 equation posted by another student and I did not obtain 338 kJ for that Hess' Law problem. You may want to revisit that problem. I specifically remember that I agreed with your answer of 338 kJ. Now I think I was incorrect.
Oh ok thank you I will look over it again.
Yes, you are correct. The answer is e) at the triple point.
In the phase diagram of a compound, different regions represent different phases of matter (solid, liquid, and gas). The triple point is the specific point on the phase diagram where all three phases coexist in equilibrium. At this point, the temperature and pressure are fixed values where the solid, liquid, and gas phases can all exist together.