Lead metal can be extracted from a mineral called galena, Chemistry

Lead metal can be extracted from a mineral called galena

Lead metal can be extracted from a mineral called galena, which contains 86.6% lead by mass. A particular ore contains 68.5% galena by mass.

If the lead can be extracted with 92.5% efficiency, what mass of ore is required to make a lead sphere with a 5.50 cm radius?

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