(a) Calculate the specific heat capacity at constant volume of water vapor, assu

Question

(a) Calculate the specific heat capacity at constant volume of water vapor, assuming the nonlinear triatomic molecule has three translational and three rotational degrees of freedom and that vibrational motion does not contribute. The molar mass of water is 18.0 g/mol (b) The actual specific heat capacity of water vapor at low pressures is about 2000 difference in specific heat capacity = kg . K. Compare this with your calculation. J/mol K Comment on the actual role of vibrational motion. This answer has not been graded yet.

Explanation / Answer

molar heat capacity of an ideal gas is:

c-v=(1/2)f.R

R=universal gas constant,f=degree of freedom

here,we got all in six degree of freedom

therefore,

c-v=(1/2).6.8.3145j/molk

=24.9435j/molk

divide by molar mass(in kg/mol)and you get the specfic heat capacity

c-v=c-v/m

=24.9435j/molk/0.018kg/mol

=1385.75j/kgk.

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