we were told to take the derivative with reapect to entropy and that would give us the slope of thr Mollier diagram and then the second derivative gives us the curvature. please show all steps

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
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we were told to take the derivative with reapect to entropy and that would give us the slope of thr Mollier diagram and then the second derivative gives us the curvature. please show all steps
In a Mollier diagram (that is, enthalpy-entropy phase diagram), such as the one attached, note that the
isotherms (the lines of constant temperature) have both a positive slope and a positive curvature. (i.e.,
that they increase and are concave downward). Starting with the Gibbs equation dH = TdS + VdP, show
that this always must happen.
1.3
0.80
14
0.82
10,000 pais
0.84
0.86
5000
POZE
0.88
1.6.
2000
400
1.5 1.6
0001
500
0.96
0.94
0.92
0.90
1.7 1.8
Joos
Entropy, Bra/lbm R
600
700 F
300
0.98
saturation.
line
800
900
1.9
MOOFE
1000
50 psia
950
1.7
1.8
Entropy, Btu/lbm-R
8
1.9
20
psia
200°F
100
2.0
1000
21 22
1.0
2.1
1050
1600
1550
1500
1450
1400
1350
1300
1250
Enthalpy, Btu/bm
1200
22
1100
1150
Transcribed Image Text:In a Mollier diagram (that is, enthalpy-entropy phase diagram), such as the one attached, note that the isotherms (the lines of constant temperature) have both a positive slope and a positive curvature. (i.e., that they increase and are concave downward). Starting with the Gibbs equation dH = TdS + VdP, show that this always must happen. 1.3 0.80 14 0.82 10,000 pais 0.84 0.86 5000 POZE 0.88 1.6. 2000 400 1.5 1.6 0001 500 0.96 0.94 0.92 0.90 1.7 1.8 Joos Entropy, Bra/lbm R 600 700 F 300 0.98 saturation. line 800 900 1.9 MOOFE 1000 50 psia 950 1.7 1.8 Entropy, Btu/lbm-R 8 1.9 20 psia 200°F 100 2.0 1000 21 22 1.0 2.1 1050 1600 1550 1500 1450 1400 1350 1300 1250 Enthalpy, Btu/bm 1200 22 1100 1150
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