Dalton’s Law of Partial Pressures Worksheet - Answer Key

 

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  1. What does Dalton’s law of partial pressures state?

    For a mixture of gases in a container, the total pressure exerted is the sum of the pressures that each gas would exert if it were alone.
                       
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  3. What is a mole fraction? 

    χa = moles of a = partial pressure of a
    total moles          total pressure

    which in turn yields…

    Pa = χa (Ptotal)

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  5. If 1.83 g of hydrogen gas and 2.42 g of helium exerts a total pressure of 0.480 atm, what is the partial pressure of each gas?

    PH2 = 0.288 atm
    PHe = 0.192 atm

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  7. A sample of N2 (g) was collected over water at 20.0oC and a total pressure of 1.04 atm.  A total volume of 3.25 x 102 mL was collected.  What mass of N2 (g) was collected?   (at 20.0oC the vapor pressure of water is 17.5 torr)

    0.386 g N2