I am relatively new in Thermodynamics as I am an electrical engineer. Right now, I am looking for an exact enthalpy calculation formula.

The Gas is N2 with Temperature 27C and Pressure 124.73 bar. From a paper the enthalphy is 288.28 kJ/kg. I also found the same answer from online calculator ( http://www.peacesoftware.de/einigewerte/calc_stickstoff.php7 ).

However, I don't know how to calculate it.

I can describe all attempts enthusiastically that I have done but I am afraid it might waste your time.

Could you please help me to find the formula for this enthalphy?

Thank's in advanced

Donny