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Homework Help: Calculate the Pressures of H2 and He: Are answers correct?

  1. Oct 13, 2008 #1
    A mixture of 1.00 g of H2 and 1.00 g of He is placed in a balloon of volume 1.0 L when filled with these gases at 27 deg C.

    A) calculate the partial pressure of each gas and the total pressure

    pressure of H2-12.315 atm?
    pressure of He-6.158 atm?

    B) calculate the mole fraction of He in the mixture.

    I need help with B
  2. jcsd
  3. Oct 14, 2008 #2


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    (A) Looks right

    (B) Start with how many moles of each gas are present.
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