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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.
Solved Problem 2.2 - Two kilograms of water at 25Â°C are placed in a piston cylinder device under 3.2 MPa pressure as shown in the diagram (State (1)). Heat is added to the water at constant pressure until the temperature of the fluid reaches 350Â°C (State (2)).Determine the final volume of the fluid at state (2).s more heat is added the water progressively changes phase from liquid to water vapor (steam) while maintaining the temperature at 100Â°C (Saturation Temperature-Tsat) until there is no liquid remaining in the cylinder (State (4) - Saturated Vapor Superheated (State (5)).