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A helium balloon contains 0.54g of helium.

Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

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2 answers
  1. 4.0 g/1mole = .54 g/x mole

    This is a proportion.
    Cross multiply to find the answer

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  2. 0.135molHe

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