Please don't answer if you don't know how to answer. I need help actually and it says "For the sake of this exercise, assume ideal gas applies"

Much of the humidity in the air comes from vaporization from large bodies of water, like the Schuylkill and Delaware Rivers. Assuming the area of Temple's main campus is 4.1103m2 and the height of the campus is 89.1m (top of Morgan Hall), calculate the energy needed to reach 72% humidity by vaporizing water from the rivers at the winter high temperature. (For the sake of this exercise, assume ideal gas applies.) a. Having trouble? Review questions from Chapter 10: 51. Much of the humidity in the air comes from vaporization from large bodies of water, like the Schuylkill and Delaware Rivers. Assuming the area of Temple's main campus is 4.1103m2 and the height of the campus is 89.1m (top of Morgan Hall), calculate the energy needed to reach 72% humidity by vaporizing water from the rivers at the winter high temperature. (For the sake of this exercise, assume ideal gas applies.) a. Having trouble? Review questions from Chapter 10: 51