a)
The enthalpy change per unit mass.
The entropy change per unit mass.
a)

Answer to Problem 98RP
The enthalpy change per unit mass is
The entropy change per unit mass is
Explanation of Solution
Refer the table A-2Ec, “Ideal gas specific heats of various common gases”, obtain the empirical correlation for the methane as
Write the enthalpy change equation
Here, specific heat capacity at constant pressure is
Write the work input to the compressor
Here, molar mass of
Write the entropy change equation
Here, universal gas constant is
Write the entropy change equation
Conclusion:
Refer table A-1E, “Molar mass, gas constant and critical properties table”, obtain the molar mass, critical temperature, critical pressure, specific heat capacity at constant pressure, and gas constant of methane as
Substitute
Substitute
Thus, the enthalpy change per unit mass is
Substitute
Substitute
Thu, the entropy change per unit mass is
b)
The change in enthalpy per unit mass.
The change in entropy per unit mass.
b)

Answer to Problem 98RP
The change in enthalpy per unit mass is
The change in entropy per unit mass is
Explanation of Solution
Calculate the reduced temperature
Here, critical temperature is
Calculate the reduced pressure
Here, critical pressure is
Calculate the reduced temperature
Here, critical temperature is
Calculate the reduced pressure
Here, critical pressure is
Calculate the change in enthalpy
Here, change in enthalpy of ideal gas is
Calculate the change in entropy
Here, change in entropy of ideal gas is
Conclusion:
Substitute 560 R for
Substitute
Refer the table A-15E, “Nelson-Obert generalized compressibility chart”, select the compressibility factor
Substitute 1560 R for
Substitute
Refer the table A-15E, “Nelson-Obert generalized compressibility chart”, select the compressibility factor
Substitute
Here, specific heat at constant pressure is
Substitute 0 for
Thus, the change in enthalpy per unit mass is
Substitute 0.00695 for
Thus, the change in entropy per unit mass is
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Chapter 12 Solutions
THERMODYNAMICS(SI UNITS,INTL.ED)EBOOK>I
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