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Figure 2: Example Graph Temperature vs. Time: Cold Water + Hot Water T= 48.4 °C at time of mixing T = 35.7 °C at time of mixing T. = 23.8 °C at time of mixing 6 7 8 9. 10 11 12 13 1 2 3 4 5 Time (min) Tem perature("C)

Figure 2: Example Graph Temperature vs. Time: Cold Water + Hot Water T= 48.4 °C at time of mixing T = 35.7 °C at time of mixing T. = 23.8 °C at time of mixing 6 7 8 9. 10 11 12 13 1 2 3 4 5 Time (min) Tem perature("C)

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.94PAE
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Calculate the heat capacity of the calorimeter for which the sample data in Figure 2 was collected. Assume that mh=mc=50.0g.

2-3 Figure 2: Example Graph Temperature vs. Time: Cold Water + Hot Water Th = 48.4 °C at time of mixing T = 35.7 °C at time of mixing' T. = 23.8 °C at time of mixing 1. 2 3 4 6 7 8. 10 11 12 13 Time (min) Once the heat capacity of the calorimeter is known, AH may be calculated for reactions 1, 2 and 3 by measuring their temperature increases upon reaction. Since the reactions are done at constant pressure, the heat released by the reaction, q,, is equal to the enthalpy change for that reaction: 9r = CAT heat released by the system (reaction) = heat absorbed by the surroundings (solution + calorimeter) = Asoln + 9cal = msoln Csoln AT + Ccal AT or 9r = -(msoln Csoln + Ccal)AT AT for these reactions is obtained from graphs by extrapolating Tf and T¡ to the time of mixing. The graphs will be similar to Figure 2 except that reactions 2 and 3 will have only two lines (two temperatures) rather than three. AH, will be determined for each of reactions 1, 2, and 3. AH3 will also be calculated using Hess's Law as described on the first page of this experiment. Comparison of the experimental and Hess's Law values of AH3 will provide a test for Hess's Law. Tem perature ("C)
Transcribed Image Text:2-3 Figure 2: Example Graph Temperature vs. Time: Cold Water + Hot Water Th = 48.4 °C at time of mixing T = 35.7 °C at time of mixing' T. = 23.8 °C at time of mixing 1. 2 3 4 6 7 8. 10 11 12 13 Time (min) Once the heat capacity of the calorimeter is known, AH may be calculated for reactions 1, 2 and 3 by measuring their temperature increases upon reaction. Since the reactions are done at constant pressure, the heat released by the reaction, q,, is equal to the enthalpy change for that reaction: 9r = CAT heat released by the system (reaction) = heat absorbed by the surroundings (solution + calorimeter) = Asoln + 9cal = msoln Csoln AT + Ccal AT or 9r = -(msoln Csoln + Ccal)AT AT for these reactions is obtained from graphs by extrapolating Tf and T¡ to the time of mixing. The graphs will be similar to Figure 2 except that reactions 2 and 3 will have only two lines (two temperatures) rather than three. AH, will be determined for each of reactions 1, 2, and 3. AH3 will also be calculated using Hess's Law as described on the first page of this experiment. Comparison of the experimental and Hess's Law values of AH3 will provide a test for Hess's Law. Tem perature ("C)
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