A change in the free energy of a system at constant temperature and pressure will be:
ΔsysG=ΔsysH−TΔsysS
At constant temperature and pressure,
ΔsysG<0(spontaneous)
ΔsysG=0(equilibrium)
ΔsysG>0(non−spontaneous)
For a system in equilibrium,
ΔG=0, under conditions of constant_____