Concern in the 1980s over the harmful effect of chlorofluorocarbons on stratospheric ozone motivated a search...

 

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Concern in the 1980s over the harmful effect of chlorofluorocarbons on stratospheric ozone motivated a search for alternative refrigerants. An early replacement was 2,2-dichloro- 1,1,1-trifluoroethane (HCFC-123). a) Compute the isenthalpic Joule-Thomson coefficient, H, for HCFC-123 at 1.00 bar and 30.0 C, given that its isothermal Joule-Thomson coefficient, T, = -3.29 10 J mol- MPa - and its Cp 110.0 J K- mol-. = b) Estimate the temperature change that would accompany adiabatic expansion of 5.00 mol of HCFC-123 from 5.00 bar to 0.50 bar at 30.0 C. Concern in the 1980s over the harmful effect of chlorofluorocarbons on stratospheric ozone motivated a search for alternative refrigerants. An early replacement was 2,2-dichloro- 1,1,1-trifluoroethane (HCFC-123). a) Compute the isenthalpic Joule-Thomson coefficient, H, for HCFC-123 at 1.00 bar and 30.0 C, given that its isothermal Joule-Thomson coefficient, T, = -3.29 10 J mol- MPa - and its Cp 110.0 J K- mol-. = b) Estimate the temperature change that would accompany adiabatic expansion of 5.00 mol of HCFC-123 from 5.00 bar to 0.50 bar at 30.0 C.