For an ideal gas with constant properties undergoing a quasi-static process, which one of the following represents the change of entropy (Δs) from state 1 to 2?

\({\rm{\Delta }}s = {C_V}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) - {C_p}\ln \left( {\frac{{{V_2}}}{{{V_1}}}} \right)\)

\({\rm{\Delta }}s = {C_P}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) - R\ln \left( {\frac{{{P_2}}}{{{P_1}}}} \right)\)

\({\rm{\Delta }}s = {C_P}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) - {C_V}\ln \left( {\frac{{{P_2}}}{{{P_1}}}} \right)\)

\({\rm{\Delta }}s = {C_V}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) + R\ln \left( {\frac{{{V_1}}}{{{V_2}}}} \right)\)

For an ideal gas with constant properties undergoing a quasi-static pr

1.	For an ideal gas with constant properties undergoing a quasi-static process, which one of the following represents the change of entropy (Δs) from state 1 to 2?
A.	\({\rm{\Delta }}s = {C_P}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) - R\ln \left( {\frac{{{P_2}}}{{{P_1}}}} \right)\)
B.	\({\rm{\Delta }}s = {C_V}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) - {C_p}\ln \left( {\frac{{{V_2}}}{{{V_1}}}} \right)\)
C.	\({\rm{\Delta }}s = {C_P}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) - {C_V}\ln \left( {\frac{{{P_2}}}{{{P_1}}}} \right)\)
D.	\({\rm{\Delta }}s = {C_V}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) + R\ln \left( {\frac{{{V_1}}}{{{V_2}}}} \right)\)
Answer» B. \({\rm{\Delta }}s = {C_V}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right) - {C_p}\ln \left( {\frac{{{V_2}}}{{{V_1}}}} \right)\)

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For an ideal gas with constant properties undergoing a quasi-static process, which one of the following represents the change of entropy (Δs) from state 1 to 2?

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