First slide

Gibb's Helmholtz equation

Question

Essential condition for a process to be spontaneous is
A) $Δ S_{s y s} = + v e$
B) $Δ H_{s y s} = - v e$
C) $Δ G_{s y s} = - v e$
D) $Δ S_{t o t a l} = + v e$

Moderate

A

B, C, D only
B

A, C, D only
C

A, B, C only
D

C, D only

Solution

Only A & B cannot decide spontaneity of a process.
Driving force is $Δ G_{s y s} .$
$∴ When Δ G_{s y s} i s - v e the process is spontaneous$
$Δ G_{s y s} = - T Δ S_{t o t a l}$
$W h e n Δ G_{s y s} is -ve, Δ S_{t o t a l} is +ve$

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