Native,\" or elemental copper can be found in nature, but most copper is mined a

Question

Native," or elemental copper can be found in nature, but most copper is mined as oxide or sulfide minerals. Chalcopyrite (CuFeS2) is one copper mineral that can be converted to elemental copper in a series of chemical steps. Reacting chalcopyrite with oxygen at high temperature produces a mixture of copper sulfide and iron oxide. The iron oxide is separated from CuS by reaction with sand (SiO2). CuS is converted to Cu2S in the process and the Cu25 is burned in air to produce Cu and So2 3rd attempt Part 1 (0.3 point) hl See Periodic TableSee Hint An average copper penny minted in the 1960s contained about 3.000 g of copper. How much chalcopyrite had be mined to produce 100 pennies? 866.6 g CuFeS2 Part 2 (0.3 point) How much chalcopyrite had to be mined to produce 100 pennies if reaction I had a percent yield of 6300 % and all other reaction steps had yield of 100%? g CufeS2 Part 3 (0.3 point) How much chalcopyrite had be mined to produce 100 pennies if each reaction involving copper proceeded in 63.00 % yield? g CuFeS2

Explanation / Answer

Answer:

Part 1: Given 1 copper penny= 3.0 g copper, therefore 100 pennis=100x 3=300 g Copper required.

183.54 g Chalcopyrite CuFeS2 -----> 63.546 gCopper (1 penny need 8.66 g Chalcopyrite )

So, for 300 g of copper how much CuFeS2 needed=(300x183.54)/63.546 =866.49 g of Chalcopyrite.

Part 2:

If 1 peeny has 63 % yield, so the amount of Chalcopyrite=(8.66x63)/100=5.45 g of Chalcopyrite.

And for 99 pennis with 100 % yield = 99*8.66=857.34 g of Chalcopyrite.

Part 3:

If 1 peeny has 63 % yield, so the amount of Chalcopyrite=(8.66x86)/100=5.45 g of Chalcopyrite

So for 100 pennis with 63 % yield =100x5.45 g=545 g of Chalcopyrite.

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