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Q.8 Nitric acid hydrates have received much attention as possible catalysts for heterogeneous reactions that bring about the Antarctic ozone hole. Worsnop et al. investigated the thermodynamic stability of these hydrates under conditions typical of the polar winter stratosphere (Science 259, 71 (1993).). They report thermodynamic data for the sublimation of mono-, di-, and trihydrates to nitric acid and water vapours, HNO3 NH2O(s) → HNO3(g) + NH2O(g), for n= 1, 2, and 3. Given AG° and A¡H° for these reactions at 220 K (see table below), use the Gibbs- Helmholtz equation to compute A,G° at 190 K. (Hint: integrate the Gibbs-Helmoltz equation within the temperature interval) 1 2 3 A,G° /(kJ mol¯1) A;H° /(kJ mol 42.6 69.4 93.2 127 188 237

Q.8 Nitric acid hydrates have received much attention as possible catalysts for heterogeneous reactions that bring about the Antarctic ozone hole. Worsnop et al. investigated the thermodynamic stability of these hydrates under conditions typical of the polar winter stratosphere (Science 259, 71 (1993).). They report thermodynamic data for the sublimation of mono-, di-, and trihydrates to nitric acid and water vapours, HNO3 NH2O(s) → HNO3(g) + NH2O(g), for n= 1, 2, and 3. Given AG° and A¡H° for these reactions at 220 K (see table below), use the Gibbs- Helmholtz equation to compute A,G° at 190 K. (Hint: integrate the Gibbs-Helmoltz equation within the temperature interval) 1 2 3 A,G° /(kJ mol¯1) A;H° /(kJ mol 42.6 69.4 93.2 127 188 237

Introduction to Chemical Engineering Thermodynamics
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
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Q.8 Nitric acid hydrates have received much attention as possible catalysts for heterogeneous reactions that bring about the Antarctic ozone hole. Worsnop et al. investigated the thermodynamic stability of these hydrates under conditions typical of the polar winter stratosphere (Science 259, 71 (1993).). They report thermodynamic data for the sublimation of mono-, di-, and trihydrates to nitric acid and water vapours, HNO3'NH2O(s) → HNO3(g) + nH,O(g), for n= 1, 2, and 3. Given A,G° and A‚H° for these reactions at 220 K (see table below), use the Gibbs- Helmholtz equation to compute A,G° at 190 K. (Hint: integrate the Gibbs-Helmoltz equation within the temperature interval) n 1 3 A,G° /(kJ mol¯') A;H° /(kJ mol" 42.6 69.4 93.2 127 188 237
Transcribed Image Text:Q.8 Nitric acid hydrates have received much attention as possible catalysts for heterogeneous reactions that bring about the Antarctic ozone hole. Worsnop et al. investigated the thermodynamic stability of these hydrates under conditions typical of the polar winter stratosphere (Science 259, 71 (1993).). They report thermodynamic data for the sublimation of mono-, di-, and trihydrates to nitric acid and water vapours, HNO3'NH2O(s) → HNO3(g) + nH,O(g), for n= 1, 2, and 3. Given A,G° and A‚H° for these reactions at 220 K (see table below), use the Gibbs- Helmholtz equation to compute A,G° at 190 K. (Hint: integrate the Gibbs-Helmoltz equation within the temperature interval) n 1 3 A,G° /(kJ mol¯') A;H° /(kJ mol" 42.6 69.4 93.2 127 188 237
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