a See page 122 6 Question (3 points) \"Native,\" or elemental copper can be foun

Question

a See page 122 6 Question (3 points) "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 Cu2S is burned in air to produce Cu and SO2: 2CuFeS2 +302 2CuS + 2FeO+ 2SO2 2FeO + 2SiO2- 2Fesio3 Cu2S + S + 20,- 2Cu + 2SO2 1205 16 QUESTI0Ns COMPLETED 16:16 ETED 4 VIEW SOLUTIONC TRY AGA here to search

Explanation / Answer

Ans

Part 1 :

100 pennies will have 3.000 x 100 = 300 g copper

1 mole of CuFeS2 will make 1 mole of Cu

183.6 g of compound will make 63.546 g of Cu

So 300 g of copper will be made out of ( 183.6 x 300) / 63.546

= 866.77 g

Part 2:

If the yield is 76.00% , the amount of chalcopyrite required will be :

76.00 = (866.77 / x) x 100

x = 1140.5 g

So 1140.5 g of chalcopyrite must be mined.

Part 3:

1 mole of CuFes2 will make 0.76 mole of CuS

0.76 mole of CuS will make 0.5776 mole of Cu2S

0.5776 mole of Cu2S will make 0.438976 mole of Cu

So 183.6 g of CuFeS2 makes 63.546 x 0.438976 = 27.9 g of Cu

So amount required to make 300 g of Cu will be : ( 300 x 183.6) / 27.9

= 1974.2 g

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