14. Chalcopyrite (CuFeS₂) is a mineral that can be converted to elemental copper in a series of three chemical steps: 2 CuFeS2(s) + 3 O2(g) → 2 CuS(s) + 2 FeO(s) + 2 SO2(g) 16 CuS(s) → 8 Cu2S(s) + S8(s) Cu2S(s) + O2(g) → 2 Cu(s) + SO2(g) If the average copper penny from the 1960s has a mass of 3.0 grams, and assuming each reaction proceeds in 100% yield, how much chalcopyrite, in grams, had to be mined to produce one dollar's worth of pennies? Hint: Start with the third equation and work back to the first doing calculations stepwise.

14. Chalcopyrite (CuFeS₂) is a mineral that can be converted to elemental copper in a series of three chemical steps: 2 CuFeS2(s) + 3 O2(g) → 2 CuS(s) + 2 FeO(s) + 2 SO2(g) 16 CuS(s) → 8 Cu2S(s) + S8(s) Cu2S(s) + O2(g) → 2 Cu(s) + SO2(g) If the average copper penny from the 1960s has a mass of 3.0 grams, and assuming each reaction proceeds in 100% yield, how much chalcopyrite, in grams, had to be mined to produce one dollar's worth of pennies? Hint: Start with the third equation and work back to the first doing calculations stepwise.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter4: Stoichiometry

Section: Chapter Questions

Problem 4.99PAE

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