Determine ?H° for the following reaction in kJ per mole of A: A + B ? C + D given: 0.101 mol of A was reacted with an excess of B in a calorimeter containing 150.0 mL of water initially at 20.5 °C. After completion of the reaction, the final temperature was 24.1 °C. The heat capacity of the calorimeter was measured to be 56.0 J/K.