9. What is the root mean square speed of Uranium Hexafluoride at 298 K and at 373 K?
11. Methane effuses through a pinhole in 64 seconds while it takes an unknown gas 124 seconds. What is the molecular mass of the unknown gas?
7. A sample of helium gas diffuses 15.0 cm in 3.0 minutes. How long would it take a sample of Cl2 gas to diffuse a distance of 15.0 cm under the same conditions?
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