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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.
There are two main types of gas thermometer, one operating at constant volume and the other at constant pressure. The constant-volume gas thermometer is by far the more widely used and so we will deal with it alone.The ideal gas equation states that for n moles of a gas: PV = nRT. and therefore for a gas at constant volume V the absolute temperature T is directly proportional to the pressure of the gas P. simple form of constant-volume gas thermometer is shown in Figure 1. The gas is enclosed in the bulb B and the pressure recorded by the difference in levels (h) of the mercury columns.