A 550 G Solution at 27

A 550 g solution at 27.27°C is produced by mixing 0.800 mol hydrocyanic acid with 0.800 mol potassium hydroxide (40.00 g/mol) in water initially at 23.20°C.Calculate the molar enthalpy of neutralization of HCN with KOH.Assume that the heat capacity of the solution is 4.18 J/(g . ^oC) .

A) "13.1 kJ/mol"
B) "-5.85 kJ/mol"
C) "5.85 kJ/mol"
D) "-11.7 kJ/mol"
E) "11.7 kJ/mol"