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  • BMAT 2003 Section 2 Q2

  • Ari Horesh

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    June 21, 2021 at 4:11 pm
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    The mass of an atom of uranium is 4 x 10-25 kg.
    What is the mass, in milligrams, of 8 million atoms of uranium?
    A 3.2 x 10^-18
    B 3.2 x 10^-17
    C 3.2 x 10^-16
    D 3.2 x 10^-15
    E 3.2 x 10^-1

  • EnterMedSchool Team

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    June 24, 2021 at 7:09 am
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    a tricky question, read it carefully so you can see the units of the question. KG and MILIgrams, not grams! so we need to do the following calculation: 8 x 10^6 uranium atoms weights = 4 x 10^-25 x 8 x 10^6 (easy enough, right?) now: We have to multiply our answer by 10^-6 in order to convert it into milligrams (the millionth of a kilo!) so it is 3.2×10^-12

    – Ari

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