4. The conditions of a gas change in a steady-flow process from 20 °C and 1000 kPa to 60 °C and 100 kPa. Devise a reversible non-flow process (any number of steps) for accomplishing this change of state and calculate AU and AH for the process on the basis of 1 mol of gas. Assume for the gas that PV/T is constant, Cv = (5/2)R and Cp = (7/2)R. %3D %3D
4. The conditions of a gas change in a steady-flow process from 20 °C and 1000 kPa to 60 °C and 100 kPa. Devise a reversible non-flow process (any number of steps) for accomplishing this change of state and calculate AU and AH for the process on the basis of 1 mol of gas. Assume for the gas that PV/T is constant, Cv = (5/2)R and Cp = (7/2)R. %3D %3D
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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Transcribed Image Text:4. The conditions of a gas change in a steady-flow process from 20 °C and
1000 kPa to 60 °C and 100 kPa. Devise a reversible non-flow process (any
number of steps) for accomplishing this change of state and calculate AU and
AH for the process on the basis of 1 mol of gas. Assume for the gas that PV/T is
constant, Cv = (5/2)R and CP = (7/2)R.
%3D
5. In the following take Cv = 20.8 and Cp = 29.1 J/mol-°C for nitrogen gas. (a)
Three moles of nitrogen at 30 °C, contained in a rigid vessel, is heated to 250 °C.
How much heat is required if the vessel has a negligible heat capacity? If the
vessel weighs 100 kg and has a heat capacity of 0.5 kJ/kg-°C, how much heat
is required? (b) Four moles of nitrogen at 200 °C is contained in a
piston/cylinder arrangement. How much heat must be extracted from this
system, which is kept at constant pressure, to cool it to 40 °C if the heat
capacity of the piston and cylinder is neglected?
%3D
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