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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.
The âboiling temperatureâ of water at a given pressure is a saturation temperature â the temperature at which water vapour and liquid are both stable (at that pressure). It is not exactly the temperature at which water boils, unless the water is heated so slowly (and mixed so well) that no bubbles ever form, and all the boiling is actually evaporation from the surface.