A 2.00 mole% sulfuric acid solution is neutralized with a 5.00 mole% sodium hydroxide solution in a continuous reactor. All reactants enter at 25°C. The standard heat of solution of sodium sulfate is – 1.17 kJ/mol Na₂SO₄, and the heat capacities of all solutions may be taken to be that of pure liquid water [4.184 kJ/(kg∙°C)].

(a) How much heat (kJ/kg acid solution fed) must be transferred to or from the reactor contents (state which ills) if the product solution emerges at 40°C?

(b) Estimate the product solution temperature if the reactor is adiabatic, neglecting heat transferred between the reactor contents and the reactor wall.