Calculate the percent purity of copper in an ore in terms of Cu2O from the given data: Weight of copper ore - 1.20-g Volume of Na2S2O3 used - 40.00-mL (1.00-mL Na2S2O3 ≈ 0.004175-g KBrO3) Molar Masses: KBrO3 = 167.0 Cu2O = 143.1 Note: Reaction between KBrO3 and Na2S2O3 happens based on the pattern of reaction in problem no.2. Bromate is used in place of iodate.

Calculate the percent purity of copper in an ore in terms of Cu2O from the given data: Weight of copper ore - 1.20-g Volume of Na2S2O3 used - 40.00-mL (1.00-mL Na2S2O3 ≈ 0.004175-g KBrO3) Molar Masses: KBrO3 = 167.0 Cu2O = 143.1 Note: Reaction between KBrO3 and Na2S2O3 happens based on the pattern of reaction in problem no.2. Bromate is used in place of iodate.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 68P

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"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+3O2=2CuS+2FeO+2SO2 2FeO+2SiO2=2FeSiO3 2CuS=Cu2S+S Cu2S+S+2O2=2Cu+2SO2 a) 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? b) How much chalcopyrite had to be mined to produce 100 pennies if reaction 1 had a percent yield of 78.00 % and all other reaction steps had yield of 100%? c) How much chalcopyrite had be mined to produce 100 pennies if each reaction involving copper proceeded in 78.00 % yield?
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