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### Lecture notes , work eqn

Posted: **Sun Jan 21, 2018 12:21 am**

by **Samira 2B**

This is from the lecture notes on Friday. Do we only use the work equation when the system is at equilibrium? Because that is when we use the derivative for the small changes in V that leads to the integral of the work eqn.

### Re: Lecture notes , work eqn

Posted: **Sun Jan 21, 2018 1:37 am**

by **Abigail Yap 2K**

Yes, I think we only use this equation when the system is at constant pressure (delta P = 0)!

### Re: Lecture notes , work eqn

Posted: **Sun Jan 21, 2018 2:47 pm**

by **Samira 2B**

So, the system being at equilibrium means that it is a reversible process?

### Re: Lecture notes , work eqn

Posted: **Sun Jan 21, 2018 3:06 pm**

by **Sarah Maraach 2K**

Yes exactly. Also, an irreversible reaction would be at equilibrium only after it has reacted, therefore it would not be able to react further.