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11 January, 15:33

Calculate the mass of 1.23*1024 helium atoms. express your answer in grams of helium.

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  1. 11 January, 17:07
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    The mass of 1.23 x10^24 helium atoms is 8.16 grams

    Calculation

    Step 1 : calculate the number of moles of He using Avogadro's constant

    that is according to Avogadro's law 1 mole = 6.02 x10^23 atoms

    ? moles = 1.23 x10 ^24 atoms

    by cross multiplication

    = (1.23 x 10^ 24 atoms x 1 moles) / 6.02 x10^23 atoms = 2.04 moles

    Step 2 : calculate mass

    mass = moles x molar mass of He

    from periodic table the molar mass of He is 4.0 g/mol

    moles = 2.04 moles x 4.0 g/mol = 8.16 grams
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