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2 January, 01:17

What is the mass of 5.35*1021 platinum atoms?

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  1. 2 January, 01:37
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    Atomic weight of a Platinum:

    195.078 u = 195.078 * 1.66 * 10^ (-27) kg = 3.2382948 * 10^ (-25) kg

    m (Pt) = 3.2382948 * 10^ (-25) * 5.35 * 10^ (21) =

    = 1.732488 * 10^ (-3) kg = 1.732448 g
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