For steady Bow through a heat exchanger at approximately atmospheric pressure, what is the final temperature, (a)

Question:

For steady Bow through a heat exchanger at approximately atmospheric pressure, what is the final temperature,
(a) When heat in the amount of 800 kJ is added to 10 mol of ethylene initially at 200(C?
(b) When heat in the amount of 2,500 kJ is added to l5 mol of 1-butene initially at 260(C?
(c) When heat in the amount of 106(Btu) is added to 40(lb mol) of ethylene initially at 50O((F)?