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4 August, 17:26

The mass of an atom of beryllium is 1.5 x 10^-26 kg. How many beryllium atoms are present in beryllium film of mass 0.37 g used as a window on an x-ray tube? Answer in units of atoms.

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  1. 4 August, 17:42
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    There are 2.5 * 10^22 beryllium atoms in 0.37 grams

    Explanation:

    Step 1: Data given

    The mass of an atom of beryllium is 1.5 x 10^-26 kg.

    Total mass = 0.37 grams

    Step 2: Calculate number of atoms

    1 atom = 1.5 * 10 ^-26 kg

    X atoms = 0.00037 kg

    X = 0.00037/1.5*10^-26

    X = 2.467 * 10^22 atoms ≈ 2.5 * 10^22 atoms

    There are 2.5 * 10^22 beryllium atoms in 0.37 grams
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