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Question

For a pure substance, a plot of Gibbs' free energy (G) against temperature at constant pressure and Gibbs' free energy (G) against pressure and constant temperature are respectively:

A
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B
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C
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D
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Solution

The correct options are
B
C
According to thermodynamics,
dG=SdT + VdP

at constant P,
dG=SdT
So the plot of G versus T is a straight line with slope = S

at constant T,
dG=VdP
So the plot of G versus P is a straight line with slope = V

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