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Assuming complete recovery of metal, which of the following ores would yield a greater quantity of copper ? (a) An ore azurite `(Cu(OH)_(2).2CuCO_(3))` containing 3.30% (by mass) (b) An ore chalcopyrite `CuFeS_(2)` containing 4.95% (by mass). |
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Answer» (a) `Cu(OH)_(2).2CuCO_(3)=3` `3xx63.5+2+12+8xx16+2xx13xx63.5=190.5g`. =344.5 g 344.5 g of ore contain Cu =190.5g 0.033 g of ore contains `Cu=((190.5g))/((344.5g))xx(0.033g)=0.0182g` (b) `CuFeS_(2)-=Cu` `63.5+56+2xx32=63.5g` 0.0495g of ore contains `Cu=((63.5g))/((183.5g))xx(0.0495g)=0.171 g` The ore azurite contains greater amount of copper. |
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