18. Assuming CO2 to be an ideal gas, calculate the work done by 10 g of CO2 in expanding isothermally and reversibly from a volume of 5 liters to 10 liters at 27°C. What are q, AE, and AH for the process?
18. Assuming CO2 to be an ideal gas, calculate the work done by 10 g of CO2 in expanding isothermally and reversibly from a volume of 5 liters to 10 liters at 27°C. What are q, AE, and AH for the process?
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:18. Assuming CO2 to be an ideal gas, calculate the work done by 10 g of CO2 in
expanding isothermally and reversibly from a volume of 5 liters to 10 liters at
27°C. What are q, AE, and AH for the process?
22. For a certain gas the van der Waals constants are a = 6.69 atm-liter²/mole²
and b = 0.057 liter. What will be the maximum work performed in the expansion
of 2 moles of the gas from 4 to 40 liters at 300°K?
25. Eight grams of O2 at 27°C and under a pressure of 10 atm are permitted to
expand adiabatically and reversibly until the final pressure is 1 atm. Find the final
temperature and the work done in the process. Assume that C, = ½ R for O2.
Transcribed Image Text:35. Suppose that a gas obeys at low pressures the equation
B
PVm = RT + ( A +
where A and B are constants independent of pressure and temperature, and Vm
is the molar volume. Derive the expression for the change in enthalpy which will
accompany the expansion of n moles of gas from a pressure P2 to a pressure P1
at temperature T.
39. For CO:(g) at 300°K and 1 atm pressure (дН/ӘР)т %—D —10.2 сal mole-1
atm-' and C,
cient of the gas for the given temperat:ıre and pressure conditions.
= 8.919 cal mole¬' degree¬1. Calculate the Joule-Thomson coeffi-
45. Compare the thermodynamic efficiencies to be expected: (a) When an
engine is allowed to operate between temperatures of 1000°K and 300°K. (b)
When an engine is allowed to operate between 1000°K and 600°K, and then the
waste heat is passed on to another engine which operates between 600°K and
300°K.
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