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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 1000kg. at this concentration, what mass of uranium is present in 1.0 mg of earth's crust?

  • math/chem -

    1.0 mg * 4 g / 1000*1000g
    =0.000 004 mg.

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