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Cp/Cv Value for H2O and H2by ZA
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#1
Jul1405, 11:13 PM

P: 13

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.



#2
Jul1505, 12:13 AM

P: 114

from the equation in my thermodynamic textbook this is my equation
Cp(T) steam = 32.24 + 0.1923e2*T + 1.055e5*T^2  3.595e9*T^3 However, there are a few things i need to mention here First the units are kJ/kmolK so you need to divide by 18 to get kJ/kgK 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/kmolK or Cp(2755) Steam = 2.35 kJ/kgK As for the Cv values, my text does not have an equation 


#3
Jul1505, 10:17 AM

Sci Advisor
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P: 2,907

I have a computer database that's giving me 1.257



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