The problem says: Enthalpy is always reported with respect to a reactant. Calculate the enthalpy change, DeltaH, for each reaction in terms of kJ/mol for one of the reactants. (i.e either HCL or NaOH). I had three reactions: 1. NaOH + HCL---->H20 +NaCl 2.NH4Cl +NaOH---->H20 +NH3 +NaCl 3. HCl +NH3---->NH4 The first reaction I measured out 25.3mL of 2.0M HCl into a foam cup, then I dumped in 25.4mL of NaOH solution into the cup... my lowest temperature was 22.6 degrees C (before two solutions re combined., and my highest was 35.7 degrees C (when the solutions were mixed). The second reaction I measured 25mL of 2.0M NaOH into a foam cup and then dumped 25.4mL of 2.0M NH4Cl solution. My lowest temperature was 22.5 degrees C (before mixing), and highest was 23.8 degrees C (after mixing). The third reaction I measured 25.3mL of 2.0M HCl into a foam cup and then dumped 25.5 mL of 2.0M NH3 solution. My lowest temperature was 22.4 degrees C (before mixing), and highest was 31. 7 degrees C (after mixing thr two solutions. Can somebody help me and show me what to do possibly, I really have no clue. Thank you so much!