Answered: Compute the change in entropy of a gas…

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

Compute the change in entropy of a gas in a process going from 300 K and 1 atm to 1200 K and 2.7 atm. Perform calculation in two ways: assuming

a) standard air approach

b) cold air approach.

Expert Solution

Step 1

Given data as per the question

T₁= 300 K

T_{2 = 1200 K}

P₁=1 atm

P₂=2.7 atm

$\begin{array}{l} (a) \\ S_{2} - S_{1} = c_{p} I n \frac{T_{2}}{T_{1}} - R I n \frac{P_{2}}{P_{1}} \\ S_{2} - S_{1} = 1.005 I n \frac{1200}{300} - 0.287 I n \frac{2.7}{1} \\ S_{2} - S_{1} = 1.1081625 \frac{k j}{k g} . k \end{array}$

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