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(A) Calculate the specific heat capacity at constant volume of water vapor, assuming the nonlinear tri-atomic molecules has three translational and three rotational degree of freedom and that vibrational motion does not contribute. The molar mass of water is 18 g/mol.(B) The actual specific heat capacity of water vapor at low pressure is about 2000 J/kg*K. Compare this with your calculation and comment on the actual role of vibrational motion.he molar mass of water is 18 g/mol. (B) The actual specific heat capacity of water vapor at low pressure is about 2000 J/kg*K. Compare this with your calculation and comment on the actual role of vibrational motion.
â Heat content, Btu/lb, of a liquid or vapor. Latent heat of vaporization. â The heat required to convert. amaterial from its liquid to its vapor phase without raising its. temperature. The latent heat of vaporization of water at 1. atmosphere pressure and 212Â°F is 970.3 Btu/lb.atent heat of vaporization â The heat required to convert amaterial from its liquid to its vapor phase without raising its temperature. The latent heat of vaporization of water at 1 atmosphere pressure and 212Â°F is 970.3 Btu/lb.