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An instant hot pack is a plastic bag with 15 g of the salt calcium chloride (CaCl₂) and an inner bag filled with 200 g of water. Squeezing the pack to break the inner bag causes the calcium chloride to dissolve in the water, which quickly increases the water temperature. The dissociation of the ionic compound is 14,0 CaCl₂ (s) Ca² (aq) + 2Cl(aq). Assume the reaction begins at 25°C and 1 atm pressure. Calcium chloride has a molar mass of 0.111 kg/mol. The specific heat of the salt solution is 3800 J/kg-K. Data on the enthalpies of formation and standard molar entropies of the salt and the ions are listed here: H; (kJ/mol) S (J/mol-K) -365 6 CaCl₂ (s) Ca³- (aq) -133.3 Cl(aq) -206.9 151.1 113.4 146.4 What temperature will the water reach? Express your answer in degrees Celsius. 195] ΑΣΦΑ T₁- Submit Request Answer Part B What is the change in the Gibbs free energy? Express your answer with the appropriate units. AG- Value Units ? "C

An instant hot pack is a plastic bag with 15 g of the salt calcium chloride (CaCl₂) and an inner bag filled with 200 g of water. Squeezing the pack to break the inner bag causes the calcium chloride to dissolve in the water, which quickly increases the water temperature. The dissociation of the ionic compound is 14,0 CaCl₂ (s) Ca² (aq) + 2Cl(aq). Assume the reaction begins at 25°C and 1 atm pressure. Calcium chloride has a molar mass of 0.111 kg/mol. The specific heat of the salt solution is 3800 J/kg-K. Data on the enthalpies of formation and standard molar entropies of the salt and the ions are listed here: H; (kJ/mol) S (J/mol-K) -365 6 CaCl₂ (s) Ca³- (aq) -133.3 Cl(aq) -206.9 151.1 113.4 146.4 What temperature will the water reach? Express your answer in degrees Celsius. 195] ΑΣΦΑ T₁- Submit Request Answer Part B What is the change in the Gibbs free energy? Express your answer with the appropriate units. AG- Value Units ? "C

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter1: Basic Concepts Of Chemistry
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Problem 49RGQ: Fluoridation of city water supplies has been practiced in the United States for several decades. It...
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An instant hot pack is a plastic bag with 15 g of the salt calcium chloride (CaCl₂) and an inner bag filled with 200 g of water. Squeezing the pack to break the inner bag causes the calcium chloride to dissolve in the water, which quickly increases the water temperature. The dissociation of the ionic compound is 14,0 CaCl₂ (s) Ca² (aq) + 2C1 (aq). Assume the reaction begins at 25°C and 1 atm pressure. Calcium chloride has a molar mass of 0.111 kg/mol. The specific heat of the salt solution is 3800 J/kg-K. Data on the enthalpies of formation and standard molar entropies of the salt and the ions are listed here: H; (kJ/mol) S (J/mol-K) CaCl₂ (s) -365.6 151.1 Ca³+ (aq) -133.3 113.4 Cl(aq) -206.9 146.4 Part A What temperature will the water reach? Express your answer in degrees Celsius. 195| ΑΣΦ Ti = Submit Part B. What is the change in the Gibbs free energy? Express your answer with the appropriate units. Request Answer AG- Value Submit Provide Feedback Request Answer Units ? °C
Transcribed Image Text:An instant hot pack is a plastic bag with 15 g of the salt calcium chloride (CaCl₂) and an inner bag filled with 200 g of water. Squeezing the pack to break the inner bag causes the calcium chloride to dissolve in the water, which quickly increases the water temperature. The dissociation of the ionic compound is 14,0 CaCl₂ (s) Ca² (aq) + 2C1 (aq). Assume the reaction begins at 25°C and 1 atm pressure. Calcium chloride has a molar mass of 0.111 kg/mol. The specific heat of the salt solution is 3800 J/kg-K. Data on the enthalpies of formation and standard molar entropies of the salt and the ions are listed here: H; (kJ/mol) S (J/mol-K) CaCl₂ (s) -365.6 151.1 Ca³+ (aq) -133.3 113.4 Cl(aq) -206.9 146.4 Part A What temperature will the water reach? Express your answer in degrees Celsius. 195| ΑΣΦ Ti = Submit Part B. What is the change in the Gibbs free energy? Express your answer with the appropriate units. Request Answer AG- Value Submit Provide Feedback Request Answer Units ? °C
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