What is the mass of He in a uniform cylindrical tube, 5mm radius, 0.1m length. Pressure at z=0 is 0.06atm, pressure at z=0.1 is 0.02atm . Temperature of the system is 298K. There is another gas in the tube that causes the pressure gradient but I don't believe that information is necessary. I know to use the idea gas law, however, I can't figure out how to account for the pressure difference when computing mass of the He in the system.

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