The criterior for a spontaneous process is

Options

A. `DeltaG gt0`
B. `DeltaG lt 0`
C. `DeltaG=0`
D. `DeltaS_("Total") lt 0`

Answer

B

Explanation

The criterior for spontaneous process is `DeltaG lt 0`. Gibbs free energy is the maximum amoung of energy available to a system during a process, that can be converted into useful work.
`DeltaG=DeltaH-TDeltaS`
It is called Gibbs-Helmholtz equation and useful in predicting the spontaneity of process.
if `DeltaG`=-ve, the process is spontaneous
If `DeltaG=+ve`, the process is non-spontaneous.
If `DeltaG`=zero, the process is in equilibrium.