Calculate the changes in internal energy and enthalpy when air changes from an initial state is 40°F and 10 atm, where its molar volume is 36.49 (ft)3(lb mol)-1, to a final state of 140°F and 1 atm. Assume for air that PV / T is constant and that Cv=5 y Cp=7 (Btu) (lb mol)-1 (F°)-1

Calculate the changes in internal energy and enthalpy when air changes from an initial state is 40°F and 10 atm, where its molar volume is 36.49 (ft)3(lb mol)-1, to a final state of 140°F and 1 atm. Assume for air that PV / T is constant and that Cv=5 y Cp=7 (Btu) (lb mol)-1 (F°)-1

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter19: Temperature, Thermal Expansion And Gas Laws

Section: Chapter Questions

Problem 61PQ

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Concept explainers

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.

Question

Calculate the changes in internal energy and enthalpy when air changes from an initial state is 40°F and 10 atm, where its molar volume is

36.49 (ft)³(lb mol)^-1, to a final state of 140°F and 1 atm. Assume for air that PV / T is constant and that C_v=5 y C_p=7 (Btu) (lb mol)^-1(F°)-1

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