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6 August, 23:06

A sample of As weighs 73.2 grams. Will a sample of Kr that contains the same number of atoms weigh more or less than 73.2 grams? (more, less) : Calculate the mass of a sample of Kr that contains the same number of atoms. grams of Kr

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  1. 6 August, 23:27
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    This means a sample of 73.2 grams As atoms weighs less than the same amount of Kr atoms

    Explanation:

    Step 1: Data given

    Mass of As = 73.2 grams

    Molar mass As = 74.92 g/mol

    Molar mass of Kr = 83.80 g/mol

    Step 2: Calculate moles As

    Moles As = Mass As / molar mass As

    Moles As = 73.2 grams. 74.92 g/mol

    Moles As = 0.977 moles

    Step 3: Calculate As atoms

    As atoms = moles As * number of Avogadro

    As atoms = 0.977 moles * 6.02 * 10^23

    As atoms = 5.88 * 10^23 As atoms

    Step 4: Calculate moles Kr

    Moles Kr = Atoms Kr / number of Avogadro

    Moles Kr = 5.88 * 10^23 Kr atoms / 6.02 * 10^23

    Moles Kr = 0.977 moles

    Step 5: Calculate mass Kr

    Mass Kr = moles Kr * molar mass Kr

    Mass Kr = 0.977 moles * 83.80 g/mol

    Mass Kr = 81.9 grams

    This means a sample of 73.2 grams As atoms weighs less than the same amount of Kr atoms
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