When to use internal energy equation


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Shanzey
Posts: 120
Joined: Wed Sep 18, 2019 12:20 am

When to use internal energy equation

Postby Shanzey » Sat Feb 08, 2020 10:36 pm

On the constants and equations sheet, there is an equation for calculating just internal energy: U=(3/2)nRT. When do we need to use this equation? Were there any questions using this in the homework?

Adam Kramer 1A
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: When to use internal energy equation

Postby Adam Kramer 1A » Sat Feb 08, 2020 11:27 pm

I believe we use this equation when we are finding molar kinetic energy. I do also remember a homework question, I believe 4.c.3 or something, where we needed this to find the change in energy with constant pressure.

Dina Marchenko 2J
Posts: 54
Joined: Thu Jul 25, 2019 12:16 am

Re: When to use internal energy equation

Postby Dina Marchenko 2J » Sat Feb 15, 2020 6:09 pm

This equation is related to the internal energy of an ideal gas and the heat capacities at constant pressure and volume for various gas molecules. I don't think we necessarily need to use it for this class.

Rebekah Alfred 1J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am
Been upvoted: 1 time

Re: When to use internal energy equation

Postby Rebekah Alfred 1J » Sat Feb 15, 2020 7:39 pm

In lecture, Dr. Lavelle mentioned this equation while explaining how a system loses energy as a result of doing work of expansion.


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