Ore grade calculations require converting the mass fraction of an ore mineral into the mass fraction of the desired metal, using the mineral's stoichiometric formula and atomic masses. Chalcopyrite (CuFeS2) contains one Cu atom per formula unit, so the Cu mass fraction within pure chalcopyrite is Cu's atomic mass divided by chalcopyrite's molar mass.
Molar mass of chalcopyrite (CuFeS2) = 63.55 (Cu) + 55.85 (Fe) + 2×32.06 (S) = 63.55 + 55.85 + 64.12 = 183.52 g/mol. Mass fraction...
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