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Homework Help: Weight of a piston

  1. Apr 29, 2009 #1
    1. The problem statement, all variables and given/known data

    A vertical cylindrical tank contains 1.80 mol of an ideal gas under a pressure of 1.05 atm at 22.0[tex]^\circ[/tex] C. The round part of the tank has a radius of 10.0 cm , and the gas is supporting a piston that can move up and down in the cylinder without friction.

    What is the mass of this piston?

    2. Relevant equations


    3. The attempt at a solution

    [tex].05*1 \; atm*.01\pi \: m^2/9.8 \approx 16.2 kg [/tex]
  2. jcsd
  3. Apr 29, 2009 #2

    Andrew Mason

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    What determines the pressure of the gas in the cylinder? How much of that force (per unit area) is due to the weight of the pistion?

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