P2D.9* Concerns over the harmful effects of chlorofluorocarbons on stratospheric ozone have motivated a search for new refrigerants. One such alternative is 1,1,1,2-tetrafluoroethane (refrigerant HFC-134a). A compendium of thermophysical properties of this substance has been published (R. Tillner- Roth and H.D. Baehr, J. Phys. Chem. Ref. Data 23, 657 (1994)) from which properties such as the Joule-Thomson coefficient u can be computed. (a) Compute u at 0.100 MPa and 300K from the following data (all referring to 300K): p/MPa 0.080 0.100 0.12 Specific enthalpy/(kJ kg"') 426.48 426.12 425.76 (The specific constant-pressure heat capacity is 0.7649kJ K' kg") (b) Com- pute u at 1.00 MPa and 350 K from the following data (all referring to 350 K): p/MPa 0.80 1.00 1.2 Specific enthalpy/(kJ kg") 461.93 459.12 456.15 (The specific constant-pressure heat capacity is 1.0392 kJ K¯' kg.)

P2D.9* Concerns over the harmful effects of chlorofluorocarbons on stratospheric ozone have motivated a search for new refrigerants. One such alternative is 1,1,1,2-tetrafluoroethane (refrigerant HFC-134a). A compendium of thermophysical properties of this substance has been published (R. Tillner- Roth and H.D. Baehr, J. Phys. Chem. Ref. Data 23, 657 (1994)) from which properties such as the Joule-Thomson coefficient u can be computed. (a) Compute u at 0.100 MPa and 300K from the following data (all referring to 300K): p/MPa 0.080 0.100 0.12 Specific enthalpy/(kJ kg"') 426.48 426.12 425.76 (The specific constant-pressure heat capacity is 0.7649kJ K' kg") (b) Com- pute u at 1.00 MPa and 350 K from the following data (all referring to 350 K): p/MPa 0.80 1.00 1.2 Specific enthalpy/(kJ kg") 461.93 459.12 456.15 (The specific constant-pressure heat capacity is 1.0392 kJ K¯' kg.)

Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter5: Thermochemistry

Section: Chapter Questions

Problem 52E: Before the introduction of chlorofluorocarbons, sulfur dioxide (enthalpy of vaporization, 6.00...

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