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

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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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