## calculating q and w in isochoric systems

isochoric/isometric: $\Delta V = 0$
isothermal: $\Delta T = 0$
isobaric: $\Delta P = 0$

Jessica Lutz 2E
Posts: 56
Joined: Fri Sep 29, 2017 7:04 am

### calculating q and w in isochoric systems

What equations do we use to find q and w when there is a change in pressure in an isochoric system (a system where the volume doesn't change)? An example of them asking for this is #4 on the practice midterm.

Chem_Mod
Posts: 18401
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: calculating q and w in isochoric systems

In an isochoric system, w = 0.

You'd need know about a temperature change to calculate $\Delta U$, and from that you can calculate q.

Chem_Mod
Posts: 18401
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: calculating q and w in isochoric systems

If there is no change in volume then no work is done according to the equation for work w=-P$\Delta$V. Since $\Delta$U = q+w, and work is 0 then q is equal to $\Delta$U. And q is generally equal to mC$\Delta$T.

Jessica Lutz 2E
Posts: 56
Joined: Fri Sep 29, 2017 7:04 am

### Re: calculating q and w in isochoric systems

Ok that makes sense. Thank you!

Return to “Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)”

### Who is online

Users browsing this forum: No registered users and 0 guests