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Homework Help: How to calculate volume of a gas at STP?

  1. Oct 3, 2012 #1
    1. The problem statement, all variables and given/known data
    Calculate the volume of .250 g of helium at STP.
    This seems so simple but I keep getting the wrong answers.
    If someone could walk me through how to do this problem so I will know how to do them for our test. Our book doesn't give a good example.

    2. Relevant equations

    I know gasses occupy 22.4 L at STP but other then that... I'm not sure how to set up this equation

    3. The attempt at a solution
    Last edited: Oct 3, 2012
  2. jcsd
  3. Oct 3, 2012 #2


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    Homework Helper
    Gold Member

    More exactly a mole of gas occupies 22.4 L .
    So how many moles is 0.25g of He? You can take the atomic mass to be 4.
    Moles and atomic mass have got to be in your book so I won't come back on this.
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