The enthalpy of neutralization of a strongt monobasic acid by a strong monoacidic base is -13,700 cal. A certain monobasic weak acid is 10% ionized in a molar solution. If the enthalpy of ionization of the weak acid is +400 cal/mole, then what is the enthalpy of neutralization of one molar solution of the weak acid? (A) -13,700 cal (B) -13,340 cal (C) -13,660 cal (D) -13,300 cal