Final Temperature 12 12.5 13 12.5 (Degrees C) Change in Temperature -12 -12 -12 -12 (ΔT) (Degrees C) Known values 4.184 Cp of Water (J/g-Degree C) Molar Mass of 1 mole of 74.60 Potassium Chloride (g) 17.22 of KCl (KJ / mol) ΔH Calculations Trial 1 Trial 2 Trial 3 Average Calculation of Qexp -5020.80 -5020.80 -5020.80 -5020.80 -5.02 -5.02 -5.02 -5.02 Convert to kJ Qexp in kJ Calculation of Qideal Q = -ΔHn 0.34 0.34 0.34 0.34 n = m / molar mass -5.77 -5.77 -5.77 -5.77 Qideal in kJ Food-Grade Potassium Chloride DATA Trial 1 Notes 100 ml Volume H2O 100 Density of water = 1.0 g/ml Mass of H2O 25 grams Mass of KCl 24 C Initial Temperature 11 C Final Temperature -13 C Change in Temperature (ΔT) 4.184 J/g-degres C Cp of Water Calculations Trial 1 Notes
Final Temperature (Degrees C) 12 12.5 13 12.5 Change in Temperature (ΔT) (Degrees C) -12 -12 -12 -12 Known values Cp of Water (J/g-Degree C) 4.184 Molar Mass of 1 mole of Potassium Chloride (g) 74.60 ΔH of KCl (KJ / mol) 17.22 Calculations Trial 1 Trial 2 Trial 3 Average Calculation of Qexp -5020.80 -5020.80 -5020.80 -5020.80 Qexp in kJ -5.02 -5.02 -5.02 -5.02 Convert to kJ Calculation of Qideal Q = -ΔHn n = m / molar mass 0.34 0.34 0.34 0.34 Qideal in kJ -5.77 -5.77 -5.77 -5.77 Food-Grade Potassium Chloride DATA Trial 1 Notes Volume H2O 100 ml Mass of H2O 100 Density of water = 1.0 g/ml Mass of KCl 25 grams Initial Temperature 24 C Final Temperature 11 C Change in Temperature (ΔT) -13 C Cp of Water 4.184 J/g-degres C Calculations Trial 1 Notes
hs-calorimeter-lesson-plan-resource-v1.4.docx