You could use Cp - Cv = R = 8.314 kJ/K-kmol, as a pretty good approximation.abercrombiems02 said:...
Cp(2755) Steam = 42.4393 kJ/kmol-K or ...
As for the Cv values, my text does not have an equation
The Cp/Cv value, also known as the heat capacity ratio, for H2O (water) is 4.18 and for H2 (hydrogen) is 1.41. This means that for every degree increase in temperature, H2O requires 4.18 times more energy to raise its temperature compared to H2.
The Cp/Cv value is dependent on the molecular structure and bonding of a substance. H2O has a more complex molecular structure and stronger hydrogen bonding compared to H2, resulting in a higher Cp/Cv value for H2O.
The Cp/Cv value is typically measured through experiments in a controlled environment. The specific heat capacity (Cp) is measured by the amount of energy required to raise the temperature of a substance by 1 degree, while the specific heat at constant volume (Cv) is measured by the amount of energy required to raise the temperature of a substance in a constant volume container by 1 degree.
The Cp/Cv value affects the thermal properties of a substance. A higher Cp/Cv value means that the substance has a higher thermal inertia and will require more energy to change its temperature. This can result in slower temperature changes and more stable thermal behavior for H2O compared to H2.
The Cp/Cv value can change for a substance depending on the conditions it is exposed to. Factors such as temperature, pressure, and phase changes can affect the Cp/Cv value of H2O and H2. Additionally, the presence of impurities or variations in the molecular structure can also impact the Cp/Cv value.