A cylinder with a movable piston contains 5.00 liters of a gas at 30 °C and 5.00 bar. The piston is slowly moved to compress the gas to 8.80 bar. Simplified Energy Balance Considering the system to be that gas in the cylinder and neglecting AE,, write and simplify the closed- system energy balance. Assume that the initial and final states are stationary, but do not assume that the system is isothermal. To which of the following expressions does the balance simplify? AU = Q OQ = - W O AU = Q + W AU Ek+Ep: = Q+ W OAU + Ek = Q + W eTextbook and Media Hint Save for Later Heat Transfer for Isothermal Compression Suppose now that the process is carried out isothermally, and the compression work done on the gas equals 7.65 L-bar. If the gas is ideal so that U is a function only of T, what is the amount of heat (a positive number in joules) transferred to or from (state which) the surroundings? (Use the gas-constant table in the back of the book to determine the factor needed to convert L-bar to joules.) IQI = i J Hint Save for Later Adiabatic Compression Attempts: 0 of 3 used Submit Answer Suppose instead that the process is adiabatic and that U increases as Tincreases. Is the final system temperature greater than, equal to, or less than 30 °C upon compression? Hint
A cylinder with a movable piston contains 5.00 liters of a gas at 30 °C and 5.00 bar. The piston is slowly moved to compress the gas to 8.80 bar. Simplified Energy Balance Considering the system to be that gas in the cylinder and neglecting AE,, write and simplify the closed- system energy balance. Assume that the initial and final states are stationary, but do not assume that the system is isothermal. To which of the following expressions does the balance simplify? AU = Q OQ = - W O AU = Q + W AU Ek+Ep: = Q+ W OAU + Ek = Q + W eTextbook and Media Hint Save for Later Heat Transfer for Isothermal Compression Suppose now that the process is carried out isothermally, and the compression work done on the gas equals 7.65 L-bar. If the gas is ideal so that U is a function only of T, what is the amount of heat (a positive number in joules) transferred to or from (state which) the surroundings? (Use the gas-constant table in the back of the book to determine the factor needed to convert L-bar to joules.) IQI = i J Hint Save for Later Adiabatic Compression Attempts: 0 of 3 used Submit Answer Suppose instead that the process is adiabatic and that U increases as Tincreases. Is the final system temperature greater than, equal to, or less than 30 °C upon compression? Hint
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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Transcribed Image Text:A cylinder with a movable piston contains 5.00 liters of a gas at 30 °C and 5.00 bar. The piston is slowly moved
to compress the gas to 8.80 bar.
Simplified Energy Balance
Considering the system to be that gas in the cylinder and neglecting AE,, write and simplify the closed-
system energy balance. Assume that the initial and final states are stationary, but do not assume that the
system is isothermal.
To which of the following expressions does the balance simplify?
AU = Q
OQ = - W
O AU = Q + W
AU Ek+Ep:
= Q+ W
OAU + Ek = Q + W
eTextbook and Media
Hint
Save for Later
Transcribed Image Text:Heat Transfer for Isothermal Compression
Suppose now that the process is carried out isothermally, and the compression work done on the gas
equals 7.65 L-bar. If the gas is ideal so that U is a function only of T, what is the amount of heat (a positive
number in joules) transferred to or from (state which) the surroundings? (Use the gas-constant table in the
back of the book to determine the factor needed to convert L-bar to joules.)
IQI
=
i
J
Hint
Save for Later
Adiabatic Compression
Attempts: 0 of 3 used
Submit Answer
Suppose instead that the process is adiabatic and that U increases as Tincreases. Is the final system
temperature greater than, equal to, or less than 30 °C upon compression?
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