20 cm³ of 1.0 molar NH₄OH solution when neutralized with 20.05cm³ of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH₄OH?

• A.-51.O KJ mol^-
• B.+57.3 KJ mol^-
• C.+57.O KJ mol^-
• D.+51.0 KJ mol^-
• E.