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It is estimated that uranium is relatively common in the earth’s crust, occurring in amounts of 4 g/metric ton. A metric ton is 1000 kg. At this concentration, what mass of uranium is present in 1.0 mg of the earth’s crust?

  • Chemistry - ,

    Use ratio/proportion as follows:
    (4 g/1 x 10^6 g) = (x g/1 x 10^-3 g)
    solve for x.
    Or set it up by dimensional analysis.
    1 x 10^-3(crust) x (4 g U/1 x 10^6 g C) = ??
    Check my arithmetic. It looks like 4 x 10^-9 g or 4 ng/metric ton.

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