An ideal gas with a constant C_P* = (7/2)R enters a steady-state throttling valve at P = 10 bar and T = 30°C. If it leaves the valve at P = 1 bar, what is the exiting temperature?

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P = 10 bar T = 30°C P = 1 bar T = ? FIGURE 6-3 Joule-Thomson expansion of an ideal gas, examined in Example 6-2.