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10.1: Gas Properties

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     Conversion between Gas Pressure Units

    Exercise \(\PageIndex{1}\)

    A pressure of 1.00 atm has a metric equivalent of 1.01 × 105 ________.

    Answer

    Pascals

    Exercise \(\PageIndex{2}\)

    Which of the following is the largest value of pressure?

    a. 0.716 atm        b. 18.3 in Hg        c. 972 mm Hg        d. 14.9 psi        e. 86572 Pa

    Answer

    c. 972 mm Hg

    Convert all to same units.

    a. 0.716 atm

    b. \(\large \frac{18.3 in Hg}{29.9213 (\frac{atm}{in Hg})} = 0.612\;atm\)

    c. \(\large \frac{972 mm Hg}{760 (\frac{atm}{mm Hg})}=1.28\;atm\)

    d. \(\large \frac{14.9 psi}{14.7\frac{atm}{psi}}=1.01\;atm\)

    e. \(\large \frac{86572 Pa}{1.01*10^{5}\frac{atm}{Pa}}=0.857\;atm\)

    Exercise \(\PageIndex{3}\)

    A particular gas exerts a pressure of 356 mm Hg. What is this pressure in units of bar? (1 atm = 760 mm Hg = 101.3 kPa = 1.013 bar)

    Answer

    0.473 bar

    Exercise \(\PageIndex{4}\)

    The local weather forecaster reports that the current barometric pressure is 15.9 inches of mercury. What is the current pressure in atmospheres?

    Answer

    0.531 atm

    Exercise \(\PageIndex{5}\)

    It is possible to make a barometer using a liquid other than mercury. What would be the height (in meters) of a column of dichloromethane at a pressure of 0.790 atm, given that 0.790 atm is equal to a 0.758 m column of mercury and the densities of mercury and dichloromethane are 13.5 g/cm3 and 1.33 g/cm3, respectively.

    Answer

    7.69 m

    \(\large d=\frac{P_{atm}}{hg}\) can be used to find the height in a column.

    Use a ratio with the pressure in atm is equal to one. 

    \(\large \frac{P_{CH_{2}Cl_{2}}}{P_{Hg}}=\frac{d_{CH_{2}Cl_{2}}*g*h_{CH_{2}Cl_{2}}}{d_{Hg}*g*h_{Hg}}\)

    \(\large \frac{0.790}{0.790}=\frac{1.33*981*h_{CH_{2}Cl_{2}}}{13.5*981*60}\) Note: Converted to cm from m.
    \(\large h_{CH_{2}Cl_{2}}=609.02 cm\)

    10.1: Gas Properties is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.

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