HOMEWORK II-4 2.29b A vapour at 22 atm and 5°C was allowed to expand adiabatically to a final pressure of 1.00 atm; the temperature fell by 10 K. Calculate the Joule–Thomson coefficient, µ , at 5°C, assuming it remains constant over this temperature range. 2.33b Given that µ = 1.11 K atm −1 for carbon dioxide, calculate the value of its isothermal Joule–Thomson coefficient. Calculate the energy that must be supplied as heat to maintain constant temperature when 12.0 mol CO 2 flows through a throttle in an isothermal Joule–Thomson experiment and the pressure drop is 55 atm. 2.3 A sample consisting of 2.0 mol CO 2 occupies a fixed volume of 15.0 dm 3 at 300 K. When it is supplied with 2.35 kJ of energy as heat its temperature increases to 341 K. Assume that CO 2 is described by the van der Waals equation of state, and calculate
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