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18 October, 09:59

Calculate both the number of moles in a sample of chromium containing 5.00 1020 atoms and the mass of the sample.

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  1. 18 October, 10:26
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    5.00 atoms containing 8.3 * 10^-24 moles this is 4.3 * 10^-22 grams

    1020 atoms containing 1.69*10^-21 moles this is 8.8 * 10^-20 grams

    Explanation:

    Step 1: Data given

    Sample 1: contains 5.00 chromium atoms

    Number of Avogadro = 6.022 * 10^23 / mol

    Molar mass of chromium = 52 g/mol

    Step 2: Calculate number of moles in 5.00 chromium atoms

    Moles = atoms / number of Avogadro

    Moles = 5.00 / 6.022 * 10^23

    Moles = 8.3 * 10^-24 moles

    Step 3: Calculate mass of 5.00 moles chromium atoms

    Mass = moles * molar mass

    Mass = 8.3 * 10^-24 moles * 52 g/mol

    Mass = 4.3 * 10^-22 grams

    Step 1: Data given

    Sample 1: contains 1020 chromium atoms

    Number of Avogadro = 6.022 * 10^23 / mol

    Step 2: Calculate number of moles in 1020 chromium atoms

    Moles = atoms / number of Avogadro

    Moles = 1020 / 6.022 * 10^23

    Moles = 1.69*10^-21 moles

    Step 3: Calculate mass of 1020 moles chromium atoms

    Mass = moles * molar mass

    Mass = 1.69*10^-21 moles * 52 g/mol

    Mass = 8.8 * 10^-20 grams
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