To design a particular kind of refrigerator, we need to know the temperature reduction brought about by adiabatic expansion of the refrigerant gas. For one type of freon, μ = 1.2 K atm-1. What pressure difference is need to provide a temperature drop of 5.0 K?
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To design a particular kind of refrigerator, we need to know the temperature reduction brought about by adiabatic expansion of the refrigerant gas. For one type of freon, μ = 1.2 K atm-1.
What pressure difference is need to provide a temperature drop of 5.0 K? Recall that (∂T/∂p )H= μ and, instead of integrating, just assume that this equation remains true when the infinitesimally small changes (∂x) are replace by finite changes (Δx).
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- Consider a container of dilute monatomic helium gas. The total internal energy of the gas is 2000 J and the average speed of the helium atoms in the gas is 1300 m s^-1. Treating the helium as an ideal gas, calculate the heat capacity at constant volume, ?v, of the helium gas in the container.The potential function between molecules of a simple non-polar gas, when the mass centres are separated by a distance r, is given by the well-known expressions: p(r) = 4€[(÷) '? – (#)*] For this gas in question: e/k = 120K and b, = No =0.063 m³/kmol a) What is the magnitude of the potential o(r) at its minimum?Part A: 10 moles of ideal gas initially at 10 atm and 250 K is expanded isothermally and reversibly to a final pressure of 2 atm. Calculate W, AU, and Q in Joules. Part B: The same gas in problem A, starting in the same initial state, is expanded isothermally against a constant external pressure of 2 atm, to a final pressure of 2 atm. Calculate W, AU, and Q in Joules for this irreversible process. Part C: The same gas in part B, starting in the same initial state, is expanded isothermally to a final pressure of 2 atm. The process is carried out in 4 stages. First the gas is expanded against a constant pressure of 8 atm, to 8 atm. Then the gas is expanded against a constant pressure of 6 atm, to 6 atm. Then the gas is expanded against a constant pressure of 4 atm, to 4 atm. Finally, the gas is expanded against a constant pressure of 2 atm, to 2 atm. Calculate W, AU, and Q in Joules for the 4-step process.
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