When to use internal energy equation

[Shanzey]

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]

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]

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]

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