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8. Calcium carbonate (CaC03) has two polymorphs, calcite and aragonite. The volume change for the calcite to aragonite transition is –2.784 cm³ /mol and is assumed to be independent of temperature and pressure. The chemical potential change for the calcite to aragonite transition as a function of temperature at 1 bar is given by Aµ = -210 + 4.2T (J/mol) (a) What is the molar heat of transition? (b) What is the molar entropy change for the transition? (c) Determine the stable phase at room temperature 298 K under 1 bar. (d) Calculate the temperature at which calcite and aragonite are at equilibrium under 1 bar. (e) Determine whether an increase in pressure at a fixed temperature will increase or decrease the thermodynamic stability of aragonite with respect to calcite.

8. Calcium carbonate (CaC03) has two polymorphs, calcite and aragonite. The volume change for the calcite to aragonite transition is –2.784 cm³ /mol and is assumed to be independent of temperature and pressure. The chemical potential change for the calcite to aragonite transition as a function of temperature at 1 bar is given by Aµ = -210 + 4.2T (J/mol) (a) What is the molar heat of transition? (b) What is the molar entropy change for the transition? (c) Determine the stable phase at room temperature 298 K under 1 bar. (d) Calculate the temperature at which calcite and aragonite are at equilibrium under 1 bar. (e) Determine whether an increase in pressure at a fixed temperature will increase or decrease the thermodynamic stability of aragonite with respect to calcite.

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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18. Calcium carbonate (CaCO3) has two polymorphs, calcite and aragonite. The volume change for the calcite to aragonite transition is -2.784 cm³ /mol and is assumed to be independent of temperature and pressure. The chemical potential change for the calcite to aragonite transition as a function of temperature at 1 bar is given by Aµ = -210 + 4.2T (J/mol) (a) What is the molar heat of transition? (b) What is the molar entropy change for the transition? (c) Determine the stable phase at room temperature 298 K under 1 bar. (d) Calculate the temperature at which calcite and aragonite are at equilibrium under 1 bar. (e) Determine whether an increase in pressure at a fixed temperature will increase or decrease the thermodynamic stability of aragonite with respect to calcite.
Transcribed Image Text:18. Calcium carbonate (CaCO3) has two polymorphs, calcite and aragonite. The volume change for the calcite to aragonite transition is -2.784 cm³ /mol and is assumed to be independent of temperature and pressure. The chemical potential change for the calcite to aragonite transition as a function of temperature at 1 bar is given by Aµ = -210 + 4.2T (J/mol) (a) What is the molar heat of transition? (b) What is the molar entropy change for the transition? (c) Determine the stable phase at room temperature 298 K under 1 bar. (d) Calculate the temperature at which calcite and aragonite are at equilibrium under 1 bar. (e) Determine whether an increase in pressure at a fixed temperature will increase or decrease the thermodynamic stability of aragonite with respect to calcite.
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