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Homework Help: Mass of gas

  1. May 22, 2008 #1
    [SOLVED] Mass of gas

    1. The problem statement, all variables and given/known data

    What mass of He gas occupies 8.5 L at 273 K and 1 atm?

    2. Relevant equations

    PV = nRT

    3. The attempt at a solution

    n = PV/RT = (101 kPa * 8.5 L)/(8.3145 * 273 K) = 2.64E-3 mol --> 10.6 g

    My solutions manual says 1.52 g. Am I right or wrong?
  2. jcsd
  3. May 22, 2008 #2


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    Science Advisor
    Homework Helper

    2.64E-3 mole? Really? I seem to remember a mole of gas at STP is 22.4 liters. What does a mole of helium mass? The book is right.
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