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

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter2: The Kinetic Theory Of Gases

Section: Chapter Questions

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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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