A 100.00 mL sample of 0.200 mol/L CuSO4(aq) is mixed with 100.00 mL containing an excess of NaOH(aq). The initial temperature of both the solutions is 21.0 oC. After mixing the solutions in calorimeter, the temperature reached is 23.0 oC. Calculate the enthalpy change for the above reaction in kJ/mol.