--> O:11 ncia.wwnorton.com/1 27477stur m |L. mestr024@ucr edu Native,\"or elemen

Question

--> O:11 ncia.wwnorton.com/1 27477stur m |L. mestr024@ucr edu 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 Cu S in the process and the Cu2S is burned in air to produce Cu and SO2. 2CuFeS2 +302 2CuS + 2FeO +2SO2 Cu,S + S +20,- 2Cu + 2SO2 K 16/16 Type here to search

Explanation / Answer

part 1

from all the steps

2 mol CuFeS2 = 2 mol Cu

so that,

no of mol of Cu present in sample = w/mwt = 3/63.546 = 0.0472 mol

no of mol of CuFeS2 required = 0.0472 mol

mass of CuFeS2 required = 0.0472*183.52

              = 8.66 g

100 pennies required = 8.66*100

   = 866 g

part 2,

    percent yield = 77%

so that,

required CuFeS2 = 866 g = 77%

mass pf chalcopyrite had to be mined = 866*100/77 = 1124.67 g

part 3,

mass of Cu required per 100 = 300 g

no of mol of Cu required = w/mwt = 300/63.546 = 4.72 mol

step-4

no of mol of Cu2s required = 4.72*100/77 = 6.13 mol

step-3

no of mol of Cus required = 6.13*100/77 = 7.96 mol

step-1

no of mol of CuFes2 required = 7.96*100/77 = 10.34 mol

mass of CuFes2 required = 10.34*183.52 = 1897.6 g

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