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16 December, 10:33

What is the pressure (in atmospheres) of the sample of gas trapped in the closed-tube mercury manometer shown below if h = 23.6 cm?

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  1. 16 December, 10:39
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    Given:

    Height of the mercury manometer, h = 23.6 cm

    To determine:

    The pressure of gas trapped in the closed-tube mercury manometer

    Explanation:

    In the case of a closed tube mercury manometer, the pressure of the gas is equal to the height difference of the mercury levels in the two arms of the manometer.

    i. e. P (gas) = P (h)

    in this case, h = 23.6 cm = 236 mm

    i. e. Pgas = 236 mmHg

    Since, 1 atm = 760 mmHg

    The corresponding Pgas (atm) = 236 mmHg * 1 atm/760 mmHg = 0.311 atm

    Ans: The pressure of the gas is 0.311 atm
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