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Homework Help: Find the number of molecules

  1. May 12, 2016 #1
    1. The problem statement, all variables and given/known data
    In the balloon with volume 4 liters, is 1 gram of hydrogen. How molecules of this gas as found in 1cm3, if the molar mass of hydrogen is 2g/mol?

    2. Relevant equations

    3. The attempt at a solution
    in my book the solution final is 7.5*10^19 molecules/cm^3
  2. jcsd
  3. May 12, 2016 #2


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    What's the definition of a mole?
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