Deriving the Gibbs free energy equation
DSuniv = DSsys + DSsurr
DSsurr = -DHsys/T
DSuniv = DSsys - DHsys/T
-TDSuniv = DHsys - TDSsys
DGsys = DHsys - TDSsys
DGsys = -TDSuniv
DSuniv > 0 or DGsys < 0 for a spontaneous process
DSuniv < 0 or DGsys > 0 for a nonspontaneous process
DSuniv = 0 or DGsys = 0 for a process at equilibrium
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