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w=-PdeltaW

Posted: Sat Mar 16, 2019 10:34 pm
by Harmony Becerra
Can someone explain when we use the equation w=-PdeltaW? I saw this equation but I do not know how to apply it.

Re: w=-PdeltaW

Posted: Sat Mar 16, 2019 10:35 pm
by Noah Cook 3O
The equation is w=-PdeltaV and you can use this equation when the pressure is constant and you need to find how much work is being done on the system by expansion

Re: w=-PdeltaW

Posted: Sat Mar 16, 2019 10:44 pm
by chrisavalos-2L
This equation is w==P deltaV, this is used when you have a constant pressure and are asked to find the work that the system performed and will be given the two values for the different volumes.

Re: w=-PdeltaW

Posted: Sat Mar 16, 2019 11:25 pm
by lizettelopez1F
It can also be used in the equation of delta U=q+w. You can substitute w with -PdeltaV if w is not given to you in the problem.

Re: w=-PdeltaW

Posted: Sun Mar 17, 2019 5:30 pm
by Roberto Gonzalez 1L
When the system is under constant pressure, this equation gives you the work done by the expansion or compression of the gases. Think of a piston changing the volume of enclosed gases, as it can be derived using PV=nRT so change in moles of gas*n*R*T can also be used accordingly.

Re: w=-PdeltaW

Posted: Sun Mar 17, 2019 5:32 pm
by Anita Wong 1H
you use it for irreverible reactions. usually youre given the external pressure pushing onto the system and you need to find the work of the systemm pushing out against the external pressure. and its w = -pdeltav