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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=-PV. Since U = q+w, and work is 0 then q is equal to U. And q is generally equal to mCT.

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!