A standard heat of reaction of calcium carbide with water produces calcium oxide, carbon dioxide and hydrogen. The enthalpy is given as H _r^=+69.36 kJ/mol. Determine whether the reaction is exothermic or endothermic at 25oC and propose a strategy to keep the reactor temperature at constant. Explain the temperature effect in certain cases which a reactor can ran adiabatically. Calculate U _r^ for this reaction and explain the physical significance of your calculated value. State all assumptions and references in your calculation.