One kilogram of liquid water is placed in a pistoncylinderdevice, initially at P 5 1 bar and T 5 58C. Atthese conditions, the density of water is 1000.4 g/L.The water is heated at constant pressure to T 5 958C,at which point the density is 962.3 g/L. The externalpressure is also P 5 1 bar.A. Find the work and heat for this process. Use thetemperature-dependent value of CP given inAppendix D. Apply the relationship H 5 U + PVif conversion between H and U is necessary.B. Find the heat for this process. This time, assumethe density is constant at 1000 g/L, that CP is constantat 4.19 J/g · K, that CV ~ CP, and that U ~ Hfor a liquid.C. Compare your answers to parts A and B. The simplifyingapproximations in part B are often used forliquids (and solids); how well do they work here?
One kilogram of liquid water is placed in a pistoncylinderdevice, initially at P 5 1 bar and T 5 58C. Atthese conditions, the density of water is 1000.4 g/L.The water is heated at constant pressure to T 5 958C,at which point the density is 962.3 g/L. The externalpressure is also P 5 1 bar.A. Find the work and heat for this process. Use thetemperature-dependent value of CP given inAppendix D. Apply the relationship H 5 U + PVif conversion between H and U is necessary.B. Find the heat for this process. This time, assumethe density is constant at 1000 g/L, that CP is constantat 4.19 J/g · K, that CV ~ CP, and that U ~ Hfor a liquid.C. Compare your answers to parts A and B. The simplifyingapproximations in part B are often used forliquids (and solids); how well do they work here?
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
Problem 1.1P
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| One kilogram of liquid water is placed in a pistoncylinder device, initially at P 5 1 bar and T 5 58C. At these conditions, the density of water is 1000.4 g/L. The water is heated at constant pressure to T 5 958C, at which point the density is 962.3 g/L. The external pressure is also P 5 1 bar. A. Find the work and heat for this process. Use the temperature-dependent value of CP given in Appendix D. Apply the relationship H 5 U + PV if conversion between H and U is necessary. B. Find the heat for this process. This time, assume the density is constant at 1000 g/L, that CP is constant at 4.19 J/g · K, that CV ~ CP, and that U ~ H for a liquid. C. Compare your answers to parts A and B. The simplifying approximations in part B are often used for liquids (and solids); how well do they work here? |
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