ideal gas U

[claire ikemiya_2I]

On the equation sheet we use Ideal gas, deltaU = 3/2nRdeltaT when there's constant volume, but when theres constant pressure can we use deltaU= 5/2nRdeltaT? Or can we only use the equation given.

[Charlie Russell 2L]

Probably only use the equations on the equations sheet because I don't think you will need anything off the eq sheet for the test!

[Eliana Witham 2H]

I don't think you can use the second equation because constant volume assumes that w=0. Therefore, deltaU = q, and you use that equation. However, when there is constant pressure, work is done and you use deltaU = q + w.

[Lisa Seidl 3H]

These are both deltaU values for mono-atomic ideal gases, so both equations can be used depending on if you want to find the molar internal energy with a constant volume or constant pressure. In addition to this, there are other R values for linear and non-linear molar heat capacity.

[Jiwon_Chae_3L]

I think that it depends on the problem and what it is asking you to solve; you can't use the two equations interchangeably.

[Jeffrey Hablewitz 2I]

The change in internal energy of an ideal gas is dependent on the temperature, pressure, and volume. If one of these is constant, the change in internal energy will be different than if a different aspect was held constant.