a)
The final temperature.
a)

Answer to Problem 215RP
The final temperature is
Explanation of Solution
Write the expression for the energy balance equation for the closed system.
Here, energy change in to the system is
Write the expression for the initial pressure in the cylinder using ideal gas law.
Here, initial pressure is
Write the expression for the mass of the air at final stage using ideal gas law.
Here, final mass is
Write the expression for the mass entering the cylinder
Conclusion:
Substitute
Here, work done during the process is
From the Table A-2” Ideal-gas specific heats of various common gases” obtain the following properties for air.
Substitute
When system undergoes constant pressure process,
Substitute
Substitute
Substitute
Thus, the final temperature is
b)
The amount of mass entered the cylinder.
b)

Answer to Problem 215RP
The amount of mass entered the cylinder is
Explanation of Solution
Substitute 315.3 K for
Substitute 1.874 kg for
Thus, the amount of mass entered the cylinder is
c)
The work done during the process.
c)

Answer to Problem 215RP
The work done during the process is
Explanation of Solution
Write the expression for the work done during the process
Here, initial volume is
Conclusion:
Substitute
Thus, the work done during the process is
d)
The entropy generated for the process.
d)

Answer to Problem 215RP
The entropy generated for the process is
Explanation of Solution
Write the expression for the entropy generated during the process.
Here, entropy generation is
Conclusion:
Substitute 1.874 kg for
Thus, the entropy generated for the process is
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Chapter 7 Solutions
THERMODYNAMICS(SI UNITS,INTL.ED)EBOOK>I
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