Native, or elemental copper can be found in nature, but most copper is mined as

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 Cu 5 is burned in air to produce Cu and SO2 2CuFeS2 +30 2CuS+2Feo+2502 2CuS Cu,S+S 8th attempt Part 1 (1 point) SeePeriodic Table See 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? g CuFes 11no 18 OF 19 QUESTIONS VIEW SOLUTION

Explanation / Answer

Overall reaction :

2CuFeS2 ===> 2Cu

Atomic weights: Cu=63.5 g mol-1, Fe=55.8 g mol-1, S=32 g mol-1

So, molar mass of CuFeS2=183.3 g mol-1

Let denote a penny by symbol P.

PART 1:

100P x (3.0gCu/1P x 1molCu/63.5gCu) x (2molCuFeS2/2molCu) x 183.3gCuFeS2/1molCuFeS2

= 866g CuFeS2

PART 2:

Once you lose 16% of the Cu in the first reaction, you still carry 2 moles Cu throughout the rest of sequence.

866g CuFeS2 x 100gTheoretical/84 gActual = 1030.95 g CuFeS2

PART 3:

If you lose 84% in all four reactions, the percent yield at the end is 0.84 x 0.84x 0.84 x 0.84 = 49.7%

866gCuFeS2 x 100gTheoretical/49.7 gActual = 1742.45 g CuFeS2

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