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Manometer Diagram with Barometric Pressure?

  1. Oct 24, 2009 #1
    1. The problem statement, all variables and given/known data

    5cwrbb.jpg

    In the above manometer, attached to a sample of gas, the difference in the height of the mercury levels is 30.0mm. The barometric pressure is 754.0mm Hg. What is the pressure of the gas sample in kiloPascals ?

    ( The above figure is not drawn to scale, but the relative heights of the right and left columns of mercury are correctly shown )

    Enter a numeric answer only, no units.

    2. Relevant equations
    1)If The height of the mercury level at the gas side is higher. This means that P(atm) > P(gas), So Pgas = 754 - 30 = 724 mmHg.

    2)If The height of the mercury level at the atmosphere side is higher. This means that P(atm) < P(gas), So Pgas = 754 + 30 = 780 mmHg.


    3. The attempt at a solution

    1 mmHg = 133.3 Pa
    So:

    724*133.3 = 96509.2

    OR

    780*133.3 = 103974

    what did i do wrong ?
     
  2. jcsd
  3. Oct 24, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    You have not decided which is the correct answer.

    --
    methods
     
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