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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.
In order to determine the heat capacity of a substance we not only need to know how much heat is added, but also the conditions under which the heat transfer took place. For gases, adding heat under constant pressure and under constant temperature will lead to very different values of the specific heat capacity.he change in the temperature is proportional to the amount of heat added. The constant C is called the heat capacity of the object. The heat capacity of an object depends on its mass and the type of material of which it is made.