The change in Gibbs free energy `(DeltaG)` of the system along provides a criterion for the spontaneity of a process at constant temperature and pressure. A change in the free energy of a system at constant temperature and pressure will be:
`DeltaG_("system")=DeltaH_("system")-TDeltaS_("system")`
At constant temperature and pressure:
`DeltaG_("system")lt0` (Spontaneous)
`DeltaG_("system")=0` (equilibrium)
`DeltaG_("system")gt0` (non-spontaneous)
Free energy is related to the equilibrium constant as:
`DeltaG^(@)=2.303RTlog_(10)K_(e)`.
Q. If b oth `DeltaH and DeltaS` are negative, the reaction will be spontaneous:
A. at high temperature
B. at low temperature
C. at all temperature
D. at absolute zero
