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A horizontal cylinder equipped with a frictionless piston contains 80 g of steam at 450 K and 125 kPa. Heat is removed from the steam, causing the steam temperature to decrease, the cylinder volume to decrease by 15 L, and the internal energy to decrease by 6800 J. A constant restraining force is maintained on the piston throughout the compression, so that the pressure exerted by the piston on the steam remains constant at 125 kPa.

A horizontal cylinder equipped with a frictionless piston contains 80 g of steam at 450 K and 125 kPa. Heat is removed from the steam, causing the steam temperature to decrease, the cylinder volume to decrease by 15 L, and the internal energy to decrease by 6800 J. A constant restraining force is maintained on the piston throughout the compression, so that the pressure exerted by the piston on the steam remains constant at 125 kPa.

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
Problem 1.1P
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A horizontal cylinder equipped with a frictionless piston contains 80 g of steam at 450 K and 125 kPa. Heat is removed from the steam, causing the steam temperature to decrease, the cylinder volume to decrease by 15 L, and the internal energy to decrease by 6800 J. A constant restraining force is maintained on the piston throughout the compression, so that the pressure exerted by the piston on the steam remains constant at 125 kPa. Taking the steam as the system: Simplify the general closed system energy balance. Please justify elimination of terms. ΔU + ΔΕκ + ΔΕp = Q + W a. b. C. d. e. What is the work? Please give your answer in J. How much heat is removed from the system? Please give your answer in J. What is the final cylinder volume? Please give your answer in L. What is the final temperature of the steam? Please give your answer in K.
Transcribed Image Text:A horizontal cylinder equipped with a frictionless piston contains 80 g of steam at 450 K and 125 kPa. Heat is removed from the steam, causing the steam temperature to decrease, the cylinder volume to decrease by 15 L, and the internal energy to decrease by 6800 J. A constant restraining force is maintained on the piston throughout the compression, so that the pressure exerted by the piston on the steam remains constant at 125 kPa. Taking the steam as the system: Simplify the general closed system energy balance. Please justify elimination of terms. ΔU + ΔΕκ + ΔΕp = Q + W a. b. C. d. e. What is the work? Please give your answer in J. How much heat is removed from the system? Please give your answer in J. What is the final cylinder volume? Please give your answer in L. What is the final temperature of the steam? Please give your answer in K.
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