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chemistry

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A helium balloon contains 0.26 g of helium. How many moles of helium does it contain?

  • chemistry - ,

    ...........1 mole
    0.26g He * ------- = 0.065 moles He
    ...........4.0026g

    (you divide how many grams you have by the atomic mass [which is the # below the element symbol on the periodic table])

  • chemistry - ,

    (Sorry about the spacing, the formatting gets messed up when you post a message)

  • chemistry - ,

    Yes, spacing is a problem. We work around it by doing it this way.
    # mols = g/molar mass.
    # mols = 0.26/4.00 = ??

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