Where Can I Find an Enthalpy Calculator That Includes Pressure?

[Natla]

Hi,

Im after a calculator or software that can tell me the enthalpy of a gas.
I want something where I can enter the variables and have it tell me the enthalpy. The variables are mass (in moles), temperature and pressure.

So far I have seen ones that only use temperature and mass but not pressure.

Does anyone know where I can find one to use/download?

Even ones that must be paid for are fine.

Thanks for any help in advance.

 

[gmax137]

see NIST software "STEAM" for thermo properties of water substance. I don't know if they have similar for other gasses