A reactor vessel contains a hot fluid which is being heated while continuously stirred by a paddle agitator. The energy of the fluid is initially 1200kJ. During the heating process 400kJ of heat is added to the fluid and the agitator does 250kJ of work. Find the final energy of the fluid? If the jacket is used to cool the vessel rather than heat and instead removes 300kJ of energy, from the fluid, how much energy does the fluid have