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6.8. Liquid isobutane is throttled through a valve from an initial state of 360 K and 4000 kPa to a final pressure of 2000 kPa. Estimate the temperature change and the entropy change of the isobutane. The specific heat of liquid isobutane at 360 K is 2.78 J.g-¹.°C-1. Estimates of V and ß may be found from Eq. (3.68).

6.8. Liquid isobutane is throttled through a valve from an initial state of 360 K and 4000 kPa to a final pressure of 2000 kPa. Estimate the temperature change and the entropy change of the isobutane. The specific heat of liquid isobutane at 360 K is 2.78 J.g-¹.°C-1. Estimates of V and ß may be found from Eq. (3.68).

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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6.8. Liquid isobutane is throttled through a valve from an initial state of 360 K and 4000 kPa to a final pressure of 2000 kPa. Estimate the temperature change and the entropy change of the isobutane. The specific heat of liquid isobutane at 360 K is 2.78 J.g-¹.°C-1. Estimates of V and ß may be found from Eq. (3.68).
Transcribed Image Text:6.8. Liquid isobutane is throttled through a valve from an initial state of 360 K and 4000 kPa to a final pressure of 2000 kPa. Estimate the temperature change and the entropy change of the isobutane. The specific heat of liquid isobutane at 360 K is 2.78 J.g-¹.°C-1. Estimates of V and ß may be found from Eq. (3.68).
In addition, generalized equations are available for the estimation of molar volumes of saturated liquids. The simplest equation, proposed by Rackett, 22 is an example: Vsat = = VcZc (1-T,)2/7 An alternative form of this equation is sometimes useful: Zsat = Prz[1+(1-7,2/7] Tr (3.68) (3.69) 22H. G. Rackett, J. Chem. Eng. Data, vol. 15, pp. 514-517, 1970; see also C. F. Spencer and S. B. Adler, ibid., vol. 23, pp. 82-89, 1978, for a review of available equations.
Transcribed Image Text:In addition, generalized equations are available for the estimation of molar volumes of saturated liquids. The simplest equation, proposed by Rackett, 22 is an example: Vsat = = VcZc (1-T,)2/7 An alternative form of this equation is sometimes useful: Zsat = Prz[1+(1-7,2/7] Tr (3.68) (3.69) 22H. G. Rackett, J. Chem. Eng. Data, vol. 15, pp. 514-517, 1970; see also C. F. Spencer and S. B. Adler, ibid., vol. 23, pp. 82-89, 1978, for a review of available equations.
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