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A helium atom weighs 6.65 X 10 to the negative 24 grams. How many helium atoms are contained in a 1.0 g sample?

  • chemistry -

    to get the number of He atoms, we dive the given mass to the mass of each He:
    1.0 / (6.65 x 10^(-24)) = 1.50376 x 10^23 He atoms

    hope this helps~ :)

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