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A cylinder for storing helium (molar mass 4.00 g/mol) has an interior volume of L=5.00×10⁻² m3. The cylinder holds 4.00×10²mol of helium under pressure at 27.0⁰C. If you assume the helium atoms are spheres of radius 3.1×10⁻¹¹m. What is the mean free path of a helium atom in the tank? What is the mean free time for a helium atom moving at the rms speed?
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