delta G : gibbs free energy when 1 mol of substance formed from constituent elements at r.t.p.
both enthalpy and entropy, plus temperature is important for the determination of a spontaneous reaction, hence the equation : delta G = delta H - T delta S (units : KJ mol-1)
represents standard conditions of 298k and 1 bar
delta G < 0 : rxn is energetically feasible in the forward reaction
delta G > 0 : rxn is not energetically feasible ; rxn can only b carried out w more energy supplied , but is energetically feasible in the reverse direction
delta G = 0 : system at equilibrium, rxn is reversible and there is no net change in amt of pdts and rxtants
FOR A PROCESS TO B ENERGETICALLY FEASIBLE : deltaH - TdeltaS < 0
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