## Spontaneity

$\Delta S = \frac{q_{rev}}{T}$

Alexia_Vanegas_1G
Posts: 22
Joined: Wed Sep 21, 2016 3:00 pm

### Spontaneity

If a reaction is spontaneous on its own, how is equilibrium related to the spontaneity?

Brandon_Phan_3J
Posts: 21
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Spontaneity

If you have a system where delta G = 0, the system is at equilibrium. In order for the reaction to be a spontaneous process delta G of the system must be negative/delta S universe is positive.

Julie Barreto 3A
Posts: 21
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Spontaneity

when do you know if work is being done on the system or by the system?

Alyssa Ishimoto 1A
Posts: 10
Joined: Sat Jul 09, 2016 3:00 am

### Re: Spontaneity

Work is done on the system when the system gains energy. For example, when a gas is compressed by a piston, work is being done on the system. Work is done by the system when the system loses energy. For example, when a gas expands against a piston, work is being done by the system.

Camille_Rousculp_3A
Posts: 17
Joined: Wed Sep 21, 2016 3:00 pm

### Re: Spontaneity

w is positive if work is done by the system, and negative if work is done on the system.

w>0 work done by the system
w<0 work done on the system