what is the meaning of this equation At constant pressure d

what is the meaning of this equation?

? At constant pressure, dP =0, so dG =-SdT. We integrate eq. 5.3 (assuming a constant S) to dG dG--s dT so that -s where all properties are molar Explain in words the meaning of equation on the right (think in terms of a slope).

Solution

It is clear from the equation that

dG = -SdT

if we plot dG vs dT then it is a straight line of slope -S.

That is the Gibbs free eergy decreases with the raise in temperature and the slope of that line gives the magnitude of entropy S.