Helmholtz: Cpo(Ideal Gas)
Cpo/R =
1 + t - {åai×ni×(ni - 1)×tni}(ni¹ 0 or 1)
+ åbi×(ci×t)2×exp(ci×t) / {exp(ci×t) - 1}2;
where t = Tc/T, Tc = the critical temperature,
and the summations are from i = 1 to nTerms.
The example is for fitted heat capacities in the ideal-gas state at p = 100 kPa for 2-methylpyrrole.