Pyrite (FeS2) contains iron, which is in six-fold coordination. Pyrite is a comm
ID: 939952 • Letter: P
Question
Pyrite (FeS2) contains iron, which is in six-fold coordination. Pyrite is a common mineral found in coal and other base metal deposits. The breakdown of pyrite during combustion can result in the emission of sulfur dioxide. Pyrite can also contain various trace metals that can be released to several compartments of the environment including the atmosphere and hydrosphere.
Assuming Fe in pyrite is in the high spin state, which of the following elements; Sc, Cr, V, Co, Ni, Au, As and Sb might be found in trace amounts in pyrite? If an element can exist in more than one oxidation state, answer the question for each oxidation state. Fully explain your answers.
Explanation / Answer
Cr, Co and Ni, are found in trace amounts in pyrite.
Pyrite is probably best described as Fe2+S22. This formalism recognizes that the sulfur atoms in pyrite occur in pairs with clear S–S bonds. These persulfide units can be viewed as derived from hydrogen disulfide, H2S2. Thus pyrite would be more descriptively called iron persulfide, not iron disulfide.
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