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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et limestone is used to scrub SO2 gas from the exhaust gases of powerplants. One possible reaction gives hydrated calcium sulfite and anotherhydrated calcium sulfate.The balanced equations for the two reactions are: CaCO3 (s) + SO2 (g) + ½ H2O (l) ⇌ CaSO3∙½H2O (s) + CO2 (g) CaCO3 (s) + SO2 (g) + ½ H2O (l) + ½ O2 (g) ⇌ CaSO4∙½H2O (s) + CO2 (g) Which of the two reactions will be more product favoured?Wet limestone is used to scrub SO2 gas from the exhaust gases of powerplants. One possible reaction gives hydrated calcium sulfite and anotherhydrated calcium sulfate.The balanced equations for the two reactions are: CaCO3 (s) + SO2 (g) + ½ H2O (l) ⇌ CaSO3∙½H2O (s) + CO2 (g) CaCO3 (s) + SO2 (g) + ½ H2O (l) + ½ O2 (g) ⇌ CaSO4∙½H2O (s) + CO2 (g) Calculate rGº for the reaction CaSO3∙½H2O (s) + ½ O2 (g) ⇌ CaSO4∙½H2O (s)

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Question

Wet limestone is used to scrub SO2 gas from the exhaust gases of powerplants. One possible reaction gives hydrated calcium sulfite and anotherhydrated calcium sulfate.The balanced equations for the two reactions are:

CaCO3 (s) + SO2 (g) + ½ H2O (l) ⇌ CaSO3∙½H2O (s) + CO2 (g) CaCO3 (s) + SO2 (g) + ½ H2O (l) + ½ O2 (g) ⇌ CaSO4∙½H2O (s) + CO2 (g)

Which of the two reactions will be more product favoured?

Thermodynamic quantities for Selected Substances at 298.15 K (25°C)
AHP
AGO
s°
(kJ/mol)
(kJ/mol)
(9/mol•K)
CasO3-%H2O (s)
-1311.7
121.3
CasOa-%H2O (s)
-1574.65
134.8
CaCO3 (s)
-1207.6
-1129.16
91.7
SO2 (g)
-296.84
-300.13
248.21
H20 (I)
-285.83
-237.15
69.95

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