Question about Heat Capacities at Constant Volume and Constant Pressure  [ENDORSED]

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Nathan Sanchez 1F
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Joined: Sat Jul 09, 2016 3:00 am

Question about Heat Capacities at Constant Volume and Constant Pressure

Postby Nathan Sanchez 1F » Sat Jan 21, 2017 4:20 pm

In the book it says that the molar heat capacity of an ideal gas at constant pressure is greater than that at constant volume? Why is that?

ChristineCastanon_1B
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Joined: Wed Sep 21, 2016 2:59 pm

Re: Question about Heat Capacities at Constant Volume and Constant Pressure  [ENDORSED]

Postby ChristineCastanon_1B » Sat Jan 21, 2017 9:07 pm

The heat capacity at constant pressure is greater than the heat capacity at constant volume because when heat is added at constant pressure, the substance expands and work. Because some of this energy is lost due to expansion work done by the system, more energy then has to be supplied to increase the system's temperature by the same amount.

Hope this helps!

Stephanie_Younan_3D
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Joined: Sat Jul 09, 2016 3:00 am

Re: Question about Heat Capacities at Constant Volume and Constant Pressure

Postby Stephanie_Younan_3D » Sat Jan 21, 2017 11:36 pm

Which formulas include qp instead and qv and why is there such a difference between them? Why does qp equal deltaH and qv doesn't?


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