Explanation Write formula for enthalpy departure factor ( Z h ) on molar basis. Z h = ( h ¯ ideal − h ¯ ) T , P R u T cr (I) Here, the molar enthalpy at ideal gas state is h ¯ ideal , the molar enthalpy and normal state is h ¯ , the universal gas constant is R u , and the critical temperature is T cr ; The subscripts T , P indicates the correspondence of given temperature and pressure. Rearrange the Equation (I) to obtain h ¯ . h ¯ = h ¯ ideal − Z h R u T cr (II) The error in enthalpy is expressed as follows. % Error = ( h ¯ ideal − h ¯ ) T , P h ¯ × 100 (III) Refer Table A-1, “Molar mass, gas constant, and critical-point properties”. The critical temperature and pressure of carbon dioxide ( CO 2 ) gas is as follows. T cr = 304.2 K P cr = 7.39 MPa The reduced pressure ( P R ) and temperatures ( T R ) are expressed as follows. T R = T T cr = 300 K 304.2 K = 0.986 P R = P P cr = 5 MPa 7.39 MPa = 0.676 Refer Figure A-29, “Generalized enthalpy departure chart”. The enthalpy departure factor ( Z h ) corresponding the reduced pressure ( P R ) and reduced temperature ( T R ) is 0

9th Edition

ISBN: 9781259822674

Author: Yunus A. Cengel Dr., Michael A. Boles

Publisher: McGraw-Hill Education

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Chapter 12.6, Problem 105FEP

To determine

The error involved in the enthalpy of CO2 at 300 K and 5 MPa while assumed to be an ideal gas from the following:

(a) 0 %

(b) 9 %

(c) 16 %

(d) 22 %

(e) 27 %

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Chapter 12.6, Problem 104FEP

Chapter 12.6, Problem 106FEP

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The error involved in the enthalpy of CO 2 at 300 K and 5 MPa while assumed to be an ideal gas from the following: (a) 0 % (b) 9 % (c) 16 % (d) 22 % (e) 27 %

Solution Summary: The author explains the error involved in the enthalpy of CO_2 at 300

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The error involved in the enthalpy of CO2 at 300 K and 5 MPa while assumed to be an ideal gas from the following:

(a) 0 %

(b) 9 %

(c) 16 %

(d) 22 %

(e) 27 %

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Chapter 12 Solutions

The error involved in the enthalpy of CO 2 at 300 K and 5 MPa while assumed to be an ideal gas from the following: (a) 0 % (b) 9 % (c) 16 % (d) 22 % (e) 27 %

Solution Summary: The author explains the error involved in the enthalpy of CO_2 at 300

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The error involved in the enthalpy of CO2 at 300 K and 5 MPa while assumed to be an ideal gas from the following: (a) 0 % (b) 9 % (c) 16 % (d) 22 % (e) 27 %

Want to see the full answer?

Chapter 12 Solutions

The error involved in the enthalpy of CO2 at 300 K and 5 MPa while assumed to be an ideal gas from the following:

(a) 0 %

(b) 9 %

(c) 16 %

(d) 22 %

(e) 27 %