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2. Evaluating the effect of temperature on the solubility and the activity coefficient of a gaseous compound (Freon 12; dichlorodifluoromethane) in fresh water and sea water. For an assessment of the global distribution of persistent volatile halogenated hydrocarbons, the solubility and activity coefficients of such compounds in natural waters need to be known. Warner and Weiss (1985) determined the solubilities of Freon 12 at 1 bar partial pressure at various temperatures in fresh water and sea water: fresh water T(C) 0.9 9.6 19.9 29.9 40.7 CW 1 bar (M) 0.0090 0.0056 0.0035 0.0025 0.0018 sea water T(C) 4.8 9.2 20.4 29.6 39.9 1 cwbar (M) 0.0049 0.0040 0.0024 0.00170.0013 (a) Estimate the solubilities (M) of Freon 12 in freshwater and seawater at 1 bar pressure at 5 and 25 Answer: fresh water for 5 and 260, 0.0071 and 0.0031 M sea wator for 5 and 25C, 0.0047 and 0.0021 M (b) Calculate the activity coefficients of Freon 12 in fresh and sea water at these temperatures using the vapor pressure-temperature data given in Problem P 8.3. Answers: fresh water for 5 and 25C, 2,170 and 2,790; sea water for 5 and 25C, 3,280 and 4,120 (c) Determine the average excess enthalpy (AWH6; kJ moll) of Freon 12 in fresh and sea water for the ambient temperature range (0 to 40C). You'll need the p-T data from Problem P 8.3 to get the enthalpy of vaporization of Freon 12. Answers: fresh water, -8,5 kJ mol: sea water, -7,6 kJ mor! (d) Based on solubilities determined in part (a) for 25C, what is the Setchenow constant ks for Freon 12? Answer: 0.34 2. Evaluating the effect of temperature on the solubility and the activity coefficient of a gaseous compound (Freon 12; dichlorodifluoromethane) in fresh water and sea water. For an assessment of the global distribution of persistent volatile halogenated hydrocarbons, the solubility and activity coefficients of such compounds in natural waters need to be known. Warner and Weiss (1985) determined the solubilities of Freon 12 at 1 bar partial pressure at various temperatures in fresh water and sea water: fresh water T(C) 0.9 9.6 19.9 29.9 40.7 CW 1 bar (M) 0.0090 0.0056 0.0035 0.0025 0.0018 sea water T(C) 4.8 9.2 20.4 29.6 39.9 1 cwbar (M) 0.0049 0.0040 0.0024 0.00170.0013 (a) Estimate the solubilities (M) of Freon 12 in freshwater and seawater at 1 bar pressure at 5 and 25 Answer: fresh water for 5 and 260, 0.0071 and 0.0031 M sea wator for 5 and 25C, 0.0047 and 0.0021 M (b) Calculate the activity coefficients of Freon 12 in fresh and sea water at these temperatures using the vapor pressure-temperature data given in Problem P 8.3. Answers: fresh water for 5 and 25C, 2,170 and 2,790; sea water for 5 and 25C, 3,280 and 4,120 (c) Determine the average excess enthalpy (AWH6; kJ moll) of Freon 12 in fresh and sea water for the ambient temperature range (0 to 40C). You'll need the p-T data from Problem P 8.3 to get the enthalpy of vaporization of Freon 12. Answers: fresh water, -8,5 kJ mol: sea water, -7,6 kJ mor! (d) Based on solubilities determined in part (a) for 25C, what is the Setchenow constant ks for Freon 12? Answer: 0.34