In the following take Cy= 5 and Cp =7 (Btu)(lb mole)-'(°F)-l for nitrogen gas: (a) Three pound moles of nitrogen at 70(°F), contained in a rigid vessel, is heated to 350(°F). How much heat is required if the vessel has a negligible heat capac- ity? If it weighs 200(lbm) and has a heat capacity of 0.12(Btu)(lbm)-|(°F)-1, how much heat is required? (b) Four pound moles of nitrogen at 400(°F) is contained in a piston/cylinder arrangement. How much heat must be extracted from this system, which is kept at constant pres- sure, to cool it to 150(°F) if the heat capacity of the piston and cylinder is neglected?
In the following take Cy= 5 and Cp =7 (Btu)(lb mole)-'(°F)-l for nitrogen gas: (a) Three pound moles of nitrogen at 70(°F), contained in a rigid vessel, is heated to 350(°F). How much heat is required if the vessel has a negligible heat capac- ity? If it weighs 200(lbm) and has a heat capacity of 0.12(Btu)(lbm)-|(°F)-1, how much heat is required? (b) Four pound moles of nitrogen at 400(°F) is contained in a piston/cylinder arrangement. How much heat must be extracted from this system, which is kept at constant pres- sure, to cool it to 150(°F) if the heat capacity of the piston and cylinder is neglected?
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:. In the following take Cy= 5 and Cp = 7 (Btu)(1b mole)-'(°F)-! for nitrogen gas:
(a) Three pound moles of nitrogen at 70(°F), contained in a rigid vessel, is heated
to 350(°F). How much heat is required if the vessel has a negligible heat capac-
ity? If it weighs 200(lbm) and has a heat capacity of 0.12(Btu)(lbm)¬1(°F)-l, how
much heat is required?
(b) Four pound moles of nitrogen at 400(°F) is contained in a piston/cylinder arrangement.
How much heat must be extracted from this system, which is kept at constant pres-
sure, to cool it to 150(°F) if the heat capacity of the piston and cylinder is neglected?
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