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The dissolution of calcium chloride in water CaCl2(s) → Ca²+(aq) + 2 Cl¯(aq) is used in first-aid hot packs. In these packs, an inner pouch containing the salt is broken, allowing the salt to dissolve in the surrounding water. (a) Calculate the standard enthalpy change AH° for this reaction, using data from Appendix D. (b) Suppose 20.0 g CaCl, is dissolved in 0.100L water at 20.0°C. Calculate the temperature reached by the solu- tion, assuming it to be an ideal solution with a heat capacity close to that of 100 g pure water (418 JK-!).

The dissolution of calcium chloride in water CaCl2(s) → Ca²+(aq) + 2 Cl¯(aq) is used in first-aid hot packs. In these packs, an inner pouch containing the salt is broken, allowing the salt to dissolve in the surrounding water. (a) Calculate the standard enthalpy change AH° for this reaction, using data from Appendix D. (b) Suppose 20.0 g CaCl, is dissolved in 0.100L water at 20.0°C. Calculate the temperature reached by the solu- tion, assuming it to be an ideal solution with a heat capacity close to that of 100 g pure water (418 JK-!).

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter12: Thermodynamic Processes And Thermochemistry
Section: Chapter Questions
Problem 41P
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The dissolution of calcium chloride in water CaCl2(s) → Ca²+(aq) + 2 Cl¯(aq) is used in first-aid hot packs. In these packs, an inner pouch containing the salt is broken, allowing the salt to dissolve in the surrounding water. (a) Calculate the standard enthalpy change AH° for this reaction, using data from Appendix D. (b) Suppose 20.0 g CaCl, is dissolved in 0.100L water at 20.0°C. Calculate the temperature reached by the solu- tion, assuming it to be an ideal solution with a heat capacity close to that of 100 g pure water (418 JK-!).
Transcribed Image Text:The dissolution of calcium chloride in water CaCl2(s) → Ca²+(aq) + 2 Cl¯(aq) is used in first-aid hot packs. In these packs, an inner pouch containing the salt is broken, allowing the salt to dissolve in the surrounding water. (a) Calculate the standard enthalpy change AH° for this reaction, using data from Appendix D. (b) Suppose 20.0 g CaCl, is dissolved in 0.100L water at 20.0°C. Calculate the temperature reached by the solu- tion, assuming it to be an ideal solution with a heat capacity close to that of 100 g pure water (418 JK-!).
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