Solution Found!
Using Entropy Data and ConceptsOne-quarter lbmol of
Chapter 6, Problem 13P(choose chapter or problem)
One-quarter lbmol of nitrogen gas \(\left(\mathrm{N}_{2}\right)\) undergoes a process from \(p_{1}=20 \mathrm{\ lbf} / \mathrm{in} .^{2}, \ T_{1}=500^{\circ} \mathrm{R}\) to \(p_{2}=150 \mathrm{\ lbf} / \mathrm{in}^{2}\) For the process W = -500 Btu and Q = -125.9 Btu. Employing the ideal gas model, determine
(a) \(T_{2}\), in \({ }^{\circ} \mathrm{R}\).
(b) the change in entropy, in \(\text { Btu } /{ }^{\circ} \mathrm{R}\).
Show the initial and final states on a T–s diagram.
Questions & Answers
QUESTION:
One-quarter lbmol of nitrogen gas \(\left(\mathrm{N}_{2}\right)\) undergoes a process from \(p_{1}=20 \mathrm{\ lbf} / \mathrm{in} .^{2}, \ T_{1}=500^{\circ} \mathrm{R}\) to \(p_{2}=150 \mathrm{\ lbf} / \mathrm{in}^{2}\) For the process W = -500 Btu and Q = -125.9 Btu. Employing the ideal gas model, determine
(a) \(T_{2}\), in \({ }^{\circ} \mathrm{R}\).
(b) the change in entropy, in \(\text { Btu } /{ }^{\circ} \mathrm{R}\).
Show the initial and final states on a T–s diagram.
ANSWER:Step 1 of 3
We have to calculate the final temperature and change in entropy.