(Solution) - A mixture of hydrogen and uranium hexafluoride UF6 molar mass -(2025 Original AI-Free Solution)

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A mixture of hydrogen and uranium hexafluoride (UF6, molar mass: 352 kg/kmol) is stored in an abandoned oil well (in spherical chambers radioactive uranium can become critical leading to nuclear meltdown). After a long time, after thermodynamic equilibrium is achieved, a sampling at the top reveals that the mixture consists of 50-50 (by volume) mixture at 100 kPa and 300 K. Determine the
(a) Total pressure (pt) and
(b) Molar composition 3 km below the surface. Assume isothermal condition and ideal gas behavior.