Chem152_Thermo1_Report_092611

Chem152_Thermo1_Report_092611 - Name: Briana Tran Quiz...

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Unformatted text preview: Name: Briana Tran Quiz Section:BC ID Number:1129589 Lab Partner:Victoria Saykal y Total Points = 60 pts (5 notebook, 55 template) PURPOSE AND METHOD DATA AND CALCULATIONS A: HEAT CAPACITY OF THE CALORIMETER R un 1 R un 2 R un 3 Voltage, V (J/C) 3.7 3.7 N/A Cur ent, A (C/s) 2.32 2.32 N/A T im e (s) 227 280 N/A 23.5 23.7 N/A 28.4 28.5 N/A *Eletrical pow er input into calorim eter (q), J N/A 394.2 496.4 N/A 445.3 Standard Dev # NAM E? Help In Excel type "=average(range of values)" Instead of entering a range, just click at one end of the values and drag mouse to the other end. For standard deviation, in Excel type "=stdev(range of values)". B: HEAT OF FUSION OF ICE R un 1 R un 2 445.3 445.3 187.99 188.35 205.33 198.11 M ass of ice, g 17.34 9.76 24.6 23.6-0.3-0.3 11.4 14.7-13.2-8.9 * (a) H eat lost by calorim eter (q cal in J)-5,878.0-3,963 24.9 23.9 4.184 4.184 * (b) 5,878 3,963 *(c) 394.0 443.3 AVER AG E 418.7 J/g Standard Dev 35 J/g C: HEAT OF NEUTRALIZATION 2.5 pts HCl + NaOH N aOH Concentration 0.50 M Volum e Used 40 m L H Cl Concentration 0.50 M Volum e Used 40 m L R un 1 R un 2 445.3 445.3 21.8 21.8 21.8 21.8 21.8 21.8 24.9 25.1 T , C 3.1 3.3 * (a) 0.020 0.020 * (b) q (J) (m agnitude of heat gained/lost )-1,380-1,470 * (c) H (neut) (kJ/m ol)-69.0-73.5 Average, H (neut), kJ/m ol-71.3 6 pts Standard Dev 3.2 Acetic acid + NaOH N aOH Concentration 0.50 M Volum e Used 40 m L Acetic acid Concentration 0.50 M Volum e Used 40 m L R un 1 R un 2 445.3 445.3 21.9 21.9 22.0 22.0 22.0 22.0 25.1 25.3 T , C 3.1 3.3 0.020 0.020 q (J) (m agnitude of heat gained/lost )-1,380-1,470 H (neut) (kJ/m ol)-69.0-73.5 Average, H (neut), kJ/m ol-71.3 Standard Dev 3.2 D: ENTHALPY OF HYDRATION OF MAGNESIUM SULFATE 2.5 pts R un 1 R un 2 445.3 445.3 4.58 4.87 * (a) 0.0380 0.0400 23.5 24.6 32.0 33.1 T , C 8.5 8.5 * (b) q (J) (m agnitude of heat gained/lost )-3,785-3,785 * (c) H (Solution) (kJ/m ol)-99.6-94.6 Average, H (Solution), kJ/m ol-97.10 5 pts Standard Dev 3.5 R un 1 R un 2 445.3 445.3 10.3 10.3 0.0418 0.0418 24.7 24.5 23.5 23.0 T , C-1.2-1.5 q (J) (m agnitude of heat gained/lost ) 534.4 668.0 H (Solution) (kJ/m ol) 12.8 16.0 Average, H (Solution), kJ/m ol 14.4 Standard Dev 2.3 * (d) Enthalpy of H ydration 111.5 kJ/m ol RESULTS AND DISCUSSION Hint: Use heat capacity of w ater 4.184 441.1 * 278.3 50 m L (or 50 g) of w ater instead? Initial temperature, o C Final tem perature, o C 1.93 x 10 3 2.38 x 10 3 *Calorim eter C onstant, C c a l, J/ o C Average, C c a l C ca l (A verage), J/ o C Mass of calorim eter, stir bar and w ater, g Mass of calorim eter, stir bar, and w ater + m ass of added ice (or m elted ice), g Tem perature of calorim eter before ice addition, o C Tem perature of ice before addition to the calorimeter,...
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