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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.
Answers. Best Answer: The vapor pressure of nitrogen at several different temperatures is shown below. Use the data to find A) heat of vaporization & B) normal boiling point. When the vapor pressure = atmospheric pressure, the liquid boils!he vapor pressure of nitrogen at several different temperatures is shown below. Use the data to find A) heat of vaporization & B) normal boiling point. Temperature (K), Pressure (torr).