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If the lead can be extracted with 92.5% efficiency, whatmass of ore is required to make a lead sphere with a4.50 cm radius? Lead metal

If the lead can be extracted with 92.5% efficiency, whatmass of ore is required to make a lead sphere with a4.50 cm radius?

Lead metal can be extracted from a mineral called galena, whichcontains 86.6% lead by mass. A particular ore contains68.5%galena by mass.

Express your answer with the appropriate units.

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