Assuming complete recovery of metal, which of the following ores would yield, the greater quantity of copper on a mass basis?
1. an ore containing 3.30% (by mass) azurite $C u (O H)_{2} ˙ 2 C u C O_{3}$ or
2. an ore containing 4.95% (by mass) chalcopyrite $C u F e S_{2}$

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Solution

According to given data,
(a) $C u (O H)_{2} \cdot 2 C u C O_{3}      \equiv 3 C u, 344.5 g \equiv 3 \times 63.5 g C u 0.033 g = \frac{3 \times 63.5 \times 0.033 g}{344.5} C u = 0.0182 g$
(b) $C u F e S_{2} \equiv C u$ $183.5 g \equiv 63.5 g 0.0495 g = \frac{63.5 \times 0.0495}{183.5} g C u = 0.0171 g$
So (a) gives greater quantity of ore.

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