I need to find out the Cp/Cv value for Water Vapor and Hydrogen gas at 2755 K and a molar ratio of: H2O/H2:48.6112/62.5 I would at least like the Cv and Cp values for water vapor at 2755 K. A correct answer will be greatly appreciated.
from the equation in my thermodynamic textbook this is my equation Cp(T) steam = 32.24 + 0.1923e-2*T + 1.055e-5*T^2 - 3.595e-9*T^3 However, there are a few things i need to mention here First the units are kJ/kmol-K so you need to divide by 18 to get kJ/kg-K Also, this equation is over the range of 273K - 1800K with a maximum error of 0.53%, so its pretty small, If i use the same equation at 2755 K I get Cp(2755) Steam = 42.4393 kJ/kmol-K or Cp(2755) Steam = 2.35 kJ/kg-K As for the Cv values, my text does not have an equation
You could use Cp - Cv = R = 8.314 kJ/K-kmol, as a pretty good approximation. So, Cv = 42.439 - 8.314 = 34.125 kJ/K-kmol Hence, Cp/Cv = 1.244, which is not too far from the number quoted by Q_Goest.