Q in constant p and constant v

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104422816
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Q in constant p and constant v

Postby 104422816 » Tue Jan 26, 2016 3:14 pm

What are the two equations for q? The course reader has an equation for constant pressure. But what is it for variable pressure?

Erin 2I
Posts: 41
Joined: Fri Sep 25, 2015 3:00 am

Re: Q in constant p and constant v

Postby Erin 2I » Tue Jan 26, 2016 3:32 pm


C here is the specific heat capacity, which is constant.
There is also
The C here is the molar heat capacity, which is also constant. It should be noted that for all ideal gases, the molar heat capacity is for CONSTANT PRESSURE, and
for CONSTANT VOLUME.
Also, at constant pressure, , meaning that the heat calculated from any of the equations above is equal the the enthalpy of the reaction.

Chem_Mod
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Re: Q in constant p and constant v

Postby Chem_Mod » Sat Jan 30, 2016 11:37 am

The above discussion is correct! Just some clarification: Cp=5/2R and Cv=3/2R ONLY applies for MONOATOMIC ideal gases.


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