) If this substance is at the pressure and temperature of point E and the temperature is raised so that the pressure and temperature are equal to that of point F, what phase transition will occur?

The First-order phase transitions will occur.

Explanation:

The First-order phase transitions are those that involve a latent heat. During such a transition, a system either absorbs or releases a fixed (and typically large) amount of energy per volume while Second order phase transitions occur when a new state of reduced symmetry develops continuously from the disordered (high temperature) phase. The ordered phase has a lower symmetry than the Hamiltonian—the phenomenon of spontaneously broken symmetry.

There are six changes of phase that substances go through:

the answer is d. 74.02