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a. Calculate the entropy change when 300. grams of H2O (s) at -15 °C and 1.0 atm is heated to H20 (1) at +15 °C and 1.0 atm. The molar enthalpy of fusion is 6.0 kJ mol- 1, The molar heat capacities, CP,m, for H2O(s), H2O(l), H2O(g) are 39 J K-1 mol-1, 75 J K-1 mol-1, and 34 J K-1 mol-1, respectively

a. Calculate the entropy change when 300. grams of H2O (s) at -15 °C and 1.0 atm is heated to H20 (1) at +15 °C and 1.0 atm. The molar enthalpy of fusion is 6.0 kJ mol- 1, The molar heat capacities, CP,m, for H2O(s), H2O(l), H2O(g) are 39 J K-1 mol-1, 75 J K-1 mol-1, and 34 J K-1 mol-1, respectively

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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a. Calculate the entropy change when 300. grams of H2O (s) at -15 °C and 1.0 atm is heated to H2O (I) at +15 °C and 1.0 atm. The molar enthalpy of fusion is 6.0 kJ mol- 1, The molar heat capacities, CP,m, for H2O(s), H2O(1), H2O(g) are 39 J K-1 mol-1, 75 J K-1 mol-1, and 34 J K-1 mol-1, respectively ANSWER: 25.71/J/K b. 0.20 kg of ethanol (C2H5OH) is added to 1.0 kg of n-hexane (C6H14). Assuming ideal solution behaviour, calculate DGmixing at 298 K. ANSWER: -1.450kg/mol c. Calculate the vapour pressure of the solution in part (b) by assuming ideal solution behaviour. The vapour pressure of pure ethanol is 5.95 x 10^3 Pa and n- hexane is 2.07 x 10^3 Pa.
Transcribed Image Text:a. Calculate the entropy change when 300. grams of H2O (s) at -15 °C and 1.0 atm is heated to H2O (I) at +15 °C and 1.0 atm. The molar enthalpy of fusion is 6.0 kJ mol- 1, The molar heat capacities, CP,m, for H2O(s), H2O(1), H2O(g) are 39 J K-1 mol-1, 75 J K-1 mol-1, and 34 J K-1 mol-1, respectively ANSWER: 25.71/J/K b. 0.20 kg of ethanol (C2H5OH) is added to 1.0 kg of n-hexane (C6H14). Assuming ideal solution behaviour, calculate DGmixing at 298 K. ANSWER: -1.450kg/mol c. Calculate the vapour pressure of the solution in part (b) by assuming ideal solution behaviour. The vapour pressure of pure ethanol is 5.95 x 10^3 Pa and n- hexane is 2.07 x 10^3 Pa.
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