Table 2D.1 Temperature dependence of heat capacities* Substance a/(J K-1 mol-1) b/(J K-² mol-1) c/J K mol-1) C(s, graphite) 16.86 4.77 x 10-3 -8.54 x 105 CO,(g) 44.22 8.79 x 10-3 -8.62 x 105 H,O(1) N2(g) 75.29 28.58 3.77 x 10-3 -5.0 x 104 Cu(s) 22.64 6.28 x 10-3 NaCl(s) 45.94 16.32 x 10-3 The constants are for use in eqn 6a (Cm = a+ bT+ c/T). Experimental values at 25 °C are listed in the Resource section. Table 2E.1 Standard enthalpies of transition at the transition temperature* Substance Freezing point, T;/K AfugH°/(kJ mol-1) Boiling point, T,/K Avap H°/(kJ mol") Ammonia, NH3 195.3 5.65 239.7 23.4 Argon, Ar 83.8 1.2 87.3 6.5 Benzene, CHs Ethanol, C2H,OH 278.7 9.87 353.3 30.8 158.7 4.60 351.5 43.5 Helium, He 3.5 0.02 4.22 0.08 Mercury, Hg Methane, CH4 234.3 2.292 629.7 59.30 90.7 0.94 111.7 8.2 Methanol, CH,OH 175.5 3.16 337.2 35.3 Propanone, CH;COCH3 177.8 5.72 329.4 29.1 Water, H2O 273.15 6.01 373.2 40.7 * For values at 298.15 K, use the information in the Resource section. The transition temperatures are for 1 atm, but (except for very precise work) the values at 1 bar are negligibly different.
Table 2D.1 Temperature dependence of heat capacities* Substance a/(J K-1 mol-1) b/(J K-² mol-1) c/J K mol-1) C(s, graphite) 16.86 4.77 x 10-3 -8.54 x 105 CO,(g) 44.22 8.79 x 10-3 -8.62 x 105 H,O(1) N2(g) 75.29 28.58 3.77 x 10-3 -5.0 x 104 Cu(s) 22.64 6.28 x 10-3 NaCl(s) 45.94 16.32 x 10-3 The constants are for use in eqn 6a (Cm = a+ bT+ c/T). Experimental values at 25 °C are listed in the Resource section. Table 2E.1 Standard enthalpies of transition at the transition temperature* Substance Freezing point, T;/K AfugH°/(kJ mol-1) Boiling point, T,/K Avap H°/(kJ mol") Ammonia, NH3 195.3 5.65 239.7 23.4 Argon, Ar 83.8 1.2 87.3 6.5 Benzene, CHs Ethanol, C2H,OH 278.7 9.87 353.3 30.8 158.7 4.60 351.5 43.5 Helium, He 3.5 0.02 4.22 0.08 Mercury, Hg Methane, CH4 234.3 2.292 629.7 59.30 90.7 0.94 111.7 8.2 Methanol, CH,OH 175.5 3.16 337.2 35.3 Propanone, CH;COCH3 177.8 5.72 329.4 29.1 Water, H2O 273.15 6.01 373.2 40.7 * For values at 298.15 K, use the information in the Resource section. The transition temperatures are for 1 atm, but (except for very precise work) the values at 1 bar are negligibly different.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
Related questions
Question
Use the information in Tables 2D.1 and 2E.1 to calculate the energy that must be transferred as heat to melt 100 g of ice at 0 °c, increase the sample temperature to 100 °c, and then vaporize it at that temperature. Sketch a graph of temperature against time on the assumption that the sample is
heated at a constant rate.
Transcribed Image Text:Table 2D.1
Temperature dependence of heat capacities*
Substance
a/(J K-1 mol-1)
b/(J K-² mol-1)
c/J K mol-1)
C(s, graphite)
16.86
4.77 x 10-3
-8.54 x 105
CO,(g)
44.22
8.79 x 10-3
-8.62 x 105
H,O(1)
N2(g)
75.29
28.58
3.77 x 10-3
-5.0 x 104
Cu(s)
22.64
6.28 x 10-3
NaCl(s)
45.94
16.32 x 10-3
The constants are for use in eqn 6a (Cm = a+ bT+ c/T). Experimental values at 25 °C are listed in the Resource section.
Transcribed Image Text:Table 2E.1
Standard enthalpies of transition at the transition temperature*
Substance
Freezing point, T;/K
AfugH°/(kJ mol-1)
Boiling point, T,/K
Avap H°/(kJ mol")
Ammonia, NH3
195.3
5.65
239.7
23.4
Argon, Ar
83.8
1.2
87.3
6.5
Benzene, CHs
Ethanol, C2H,OH
278.7
9.87
353.3
30.8
158.7
4.60
351.5
43.5
Helium, He
3.5
0.02
4.22
0.08
Mercury, Hg
Methane, CH4
234.3
2.292
629.7
59.30
90.7
0.94
111.7
8.2
Methanol, CH,OH
175.5
3.16
337.2
35.3
Propanone, CH;COCH3
177.8
5.72
329.4
29.1
Water, H2O
273.15
6.01
373.2
40.7
* For values at 298.15 K, use the information in the Resource section. The transition temperatures are for 1 atm, but (except for very precise
work) the values at 1 bar are negligibly different.
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