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3 September, 18:27

The mass of a single molybdenum atom is 1.59*10-22 grams. How many molybdenum atoms would there be in 40.6 milligrams of molybdenum?

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  1. 3 September, 18:49
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    2.55*10²⁰ atoms of Mo are contained in 40.6 mg

    Explanation:

    1 atom of Mo has a mass of 1.59*10⁻²² g

    So let's think a rule of three for this question.

    Firstly, we convert the mass in mg to g

    40.6 mg / 1000 = 0.0406 g

    In the mass of 1.59*10⁻²² g, there is 1 atom of Mo

    In the mass of 0.0406 g there are (0.0406 / 1.59*10⁻²²) = 2.55*10²⁰ atoms
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