calculate the energy required to raise the temp of 72g of water from 50c tp 150

Answer 1

What do you not understand about this? Anytime you are within a phase it is
q = mass x specific heat x (Tfinal-Tinitial)
Phase changaes are different.
At the melting point it is q = mass x heat fusion.
At the boiling point it is q = mass x heat vaporization.

Those three equation will solve all of the problems with heating a substance.