Copy of Chem152_Thermo1_Report_092611

Copy of Chem152_Thermo1_Report_092611 - Name Michel e Bang...

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Unformatted text preview: Name: Michel e Bang Quiz Section: AG ID Number: 1021913 Lab Partner: Tessa Barclay Total Points = 60 pts (5 notebook, 55 template) PURPOSE AND METHOD DATA AND CALCULATIONS A: HEAT CAPACITY OF THE CALORIMETER Run 1 Run 2 Run 3 Voltage, V (J/C) 3.6 3.6 3.6 Cur ent, A (C/s) 2.03 2.03 2.03 Time (s) 202.94 198.72 201.88 21.6 22.1 22.2 25.6 26.1 26.2 *Eletrical power input into calorimeter (q), J 1475 1452 1475 370.8 353.1 368.8 368 Standard Dev 10 Help In Excel type "=average(range of values)" Instead of entering a range, just click at one end of the values and drag m ouse to the other end. For standard deviation, in Excel type "=stdev(range of values)". B: HEAT OF FUSION OF ICE Run 1 Run 2 368 368 113.589 113.54 120.198 118.768 Mass of ice, g 6.609 5.228 22.5 22.2 0.0 0.0 15.9 17-6.6-5.2 * (a) Heat lost by calorimeter (q cal in J)-2,429-1,914 15.9 17.0 4.184 4.184 * (b) 2,429 1,914 *(c) 301 295 AVERAGE 298 J/g Standard Dev 4 J/g C: HEAT OF NEUTRALIZATION 2.5 pts HCl + NaOH NaOH Concentration 0.50 M Volume Used 40 mL HCl Concentration 0.50 M Volume Used 40 mL Run 1 Run 2 368 368 21.5 21.5 20.8 20.9 21.15 21.2 24.4 24.7 ∆T, ˚C 3.3 3.5 * (a) 0.020 0.020 * (b) q (J) (magnitude of heat gained/lost ) 1,214 1,288 * (c) ∆H (neut) (kJ/mol)-60.7-64.4 Average, ∆H (neut), kJ/mol-62.6 6 pts Standard Dev 2.6 Acetic acid + NaOH NaOH Concentration 0.50 M Volume Used 40 mL Acetic acid Concentration 0.50 M Volume Used 40 mL Run 1 Run 2 368 368 21.8 21.6 20.8 21 21.3 21.3 24.5 24.5 ∆T, ˚C 3.2 3.2 0.020 0.020 q (J) (magnitude of heat gained/lost ) 1,178 1,178 ∆H (neut) (kJ/mol) 58.9 58.9 Average, ∆H (neut), kJ/mol 58.9 Standard Dev 0.0 D: ENTHALPY OF HYDRATION OF MAGNESIUM SULFATE 2.5 pts Run 1 Run 2 368 368 4.956 4.371 * (a) 0.04120 0.03630 22.4 22.4 31.2 30.7 ∆T, ˚C 8.8 8.3 * (b) q (J) (magnitude of heat gained/lost ) 3,238 3,054 * (c) ∆H (Solution) (kJ/mol) 78.6 84.1 Average, ∆H (Solution), kJ/mol 81.4 5 pts Standard Dev 3.9 Run 1 Run 2 368 368 10.052 10.069 0.040780 0.040849 22.6 22.6 20.8 20.9 ∆T, ˚C-1.8-2 q (J) (magnitude of heat gained/lost )-662-736 ∆H (Solution) (kJ/mol)-16.2-18.0 Average, ∆H (Solution), kJ/mol-17.1 Standard Dev 1.3 * (d) Enthalpy of Hydration-98.5 kJ/mol RESULTS AND DISCUSSION Hint: Use heat capacity of water 334 49 * 239 50 mL (or 50 g) of water instead? Initial temperature, o C Final temperature, o C *Calorimeter Constant, C cal, J/ o C Average, C cal C cal (Average), J/ o C Mass of calorimeter, stir bar and water, g Mass of calorimeter, stir bar, and water + mass of added ice (or melted ice), g Temperature of calorimeter before ice addition, o C Temperature of ice before addition to the calorimeter, o C Temp. of the calorimeter after addition and melting of the ice, o C ∆ T cal ∆Τ water from ice...
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This note was uploaded on 02/03/2012 for the course CHEM 152 taught by Professor Chiu during the Fall '08 term at University of Washington.

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