Mathematics, 12.12.2019 05:31, bacchus2847

Iwas planting a tree in my backyard and hit something hard. i dug it out and decided it was an ore of copper. i took its mass, and it was 65.0 grams. after some tricky experiments in my basement lab, i managed to extract 11.5 grams of copper. what is the mass percent of copper in the ore i discovered? a.63.5%b.18.1%c.5.65%d.17.7%

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Iwas planting a tree in my backyard and hit something hard. i dug it out and decided it was an ore o...