Answered: One mole of an ideal gas, initially at…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

One mole of an ideal gas, initially at 20 °C (293.15 K) and 1.50 bar, undergoes the following mechanically reversible changes. It is compressed isothermally to a point such that when it is heated at constant volume to 100 °C (373.15 K) its final pressure is 10 bar. Take Cp = (7/2)R and Cv = (5/2)R.

Hints:

Process 1 to 2: T₁ = T₂;

Process 2 to 3: (P₂/T₂) = (P₃/T₃), thus (P₂/T₁) = (P₃/T₃)

Use equations for isothermic and isochoric processes. W_total = W₁₂ + W₂₃ and Q_total = Q₁₂ + Q₂₃.

What is the change in internal energy?
What is the change in enthalpy?

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