## Work Calculations

204408136
Posts: 6
Joined: Mon Jan 26, 2015 2:17 pm

### Work Calculations

By the end of yesterday's discussion I understood that there are two equations that derive from the equation to observe systems at equilibrium. Can someone explain when to use either of the two for problems that require one or the other?

304621080
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### Re: Work Calculations

For the equation w=(-Pext)(DeltaV), the conditions need to be irreversible and under constant pressure. For the equation w=-nRT(ln(Vf/Vi)), the conditions need to be reversible and isothermic.

204408136
Posts: 6
Joined: Mon Jan 26, 2015 2:17 pm

### Re: Work Calculations

Thank you so much!