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We know for an irreversible process, dS>dq/T . And if the process is done at constant pressure we can take the equation as dH−TdS<0 . And we defined Gibbs energy, G=H−TS . At constant temperature and pressure dG≤0 . But the fundamental equation of Gibbs energy dG , in terms of temperature and pressure is given by dG=Vdp−SdT . And as per our original conditions, i.e. at constant pressure and temperature for an irreversible process the value dG should be less than zero. I cannot understand for the same condition the two equations give different answers.

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