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### calculating q and w in isochoric systems

Posted: **Mon Feb 12, 2018 1:58 pm**

by **Jessica Lutz 2E**

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.

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

Posted: **Mon Feb 12, 2018 2:19 pm**

by **Chem_Mod**

In an isochoric system, w = 0.

You'd need know about a temperature change to calculate

, and from that you can calculate q.

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

Posted: **Mon Feb 12, 2018 2:21 pm**

by **Chem_Mod**

If there is no change in volume then no work is done according to the equation for work w=-P

V. Since

U = q+w, and work is 0 then q is equal to

U. And q is generally equal to mC

T.

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

Posted: **Mon Feb 12, 2018 2:27 pm**

by **Jessica Lutz 2E**

Ok that makes sense. Thank you!