Page **1** of **1**

### Calculating Enthalpy with Atoms, Linear Molecules, and Nonlinear Molecules.

Posted: **Tue Feb 11, 2020 11:46 pm**

by **J Medina 2I**

What are some examples of monatomic gases where we will have to calculate enthalpy with Cv,m as 3/2 R? Will most calculations for with Cv,m use the values associated with Linear molecules (5/2 R) and Nonlinear molecules (3 R)?

### Re: Calculating Enthalpy with Atoms, Linear Molecules, and Nonlinear Molecules.

Posted: **Wed Feb 12, 2020 12:22 am**

by **Micah3J**

Yes can someone please go over when we use the 5/2R and the 3/2R? I still don't quite get when to use them and why to use them

### Re: Calculating Enthalpy with Atoms, Linear Molecules, and Nonlinear Molecules.

Posted: **Wed Feb 12, 2020 1:33 am**

by **Long Luong 2H**

The monatomic gases where we use (-)R are for when calculating the heat capacity of ideal gases so everything on the right side of the periodic table. You’d use 3/2R for monatomic ideal gases at constant volume. You’d use 5/2R for diatomic ideal gases at constant volume.