Q) The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms...
Q) The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 400. g of pure Cu?
Express your answer to three significant figures and include the appropriate units.
Homework Answers
Molar mass of Cu = 63.5 g/mol
Number of moles of Cu in 400g = Mass/Molar Mass = 400/63.5 = 6.299 moles
Since there is no reaction, i am assuming that one mole of CuFeS2 gives one mole of Cu
Moles of CuFeS2 required = 6.299 moles
Molar mass of CuFeS2 = 183.5 gm/mol
Mass of CuFeS2 required = Number of moles * molar mass = 6.299 mol * 183.5 gm/mol = 1155.8 gms
Hence the answer in Kgs will be 1.15 Kg or 1.16 Kg
Note - Post any doubts/queries in comments section.
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