Trial 1 Trial 2 Trial 3 Trial 4 Beaker 1st cup 50mL of 50mL of Mass of empty polystyrene cup 2M HCl 2M NaOH 2M HNO 3 1M HCl 2M NaOH 2M HCl 2M NaOH 2M NaOH 13.94g 14.50g 13.76g 14.19g Mass of cup + mixture 98.53g 98.86g 98.02g 96.62g Mass of mixture 84.59g 84.36g 84.26g 82.43g Initial temp of 1st reagent (from graph) 22.1°C 22.2°C 22.6°C 22.7°C Final temp of mixture (from graph) At Temperature change Total heat evolved in reaction (AHn) Number of moles of H₂O formed 36.1°C 36.0°C 36.0°C 30.0°C 14°C 13.8°C 13.4°C 7.3°C 4.94 kJ 4.87 kJ 4.72 kJ 2.52 kJ 0.100 mol 0.100 mol 0.100 mol Limiting reagent 0.050 mol Molar heat of neutralization (AH) -49.4 -48.7 -47.2 -50.4 kJ/mol kJ/mol kJ/mol kJ/mol Molar heat of neutralization calculated from Hess's Law and data on pg 138 of lab manual Percentage difference between experimental and calculated value (%Diff) Le AH - best of neutralization raolar beat of neutralization temperature charge of solution mass of final solutice -specific heat of final solution number of moles of HCI AH CA AH -mC st AH AHA Hess's law can be used to calculate the molar heat of neutralization from literature values for bears of formation of HCI, NaOH NaCl and HO. These values and the specific heat needed for the calculations are in the table below solution beat of (Uinol -164.4 hydrechione acid 4696 sodium hydrode sodium chloride 10) 407.1 RS9 100 sodium nitrate 1.00 3/19 4162 0.5 M sodium chloride+ 0.5 M sodium hydroxide 3.94