The mineral pyrite, FeS_2, if often referred to as \"fool\'s gold\" because of i

Question

The mineral pyrite, FeS_2, if often referred to as "fool's gold" because of its strong resemblance to real gold. Its unit cell structure can be described as a face-centered arrangement of iron atoms with sulfur atoms in either tetrahedral or octahedral positions. Which of the positions is most likely to contain the sulfur atoms? Justify your choice. At 35 degree C, the vapor pressure of an solution of acetone ((CH_3)_2CO, vapor pressure = 360 mm Hg) and chloroform (hccl_3, vapor pressure = 300 mm hg) is 250 mm hg. a. Is the solution exhibiting ideal behavior? Explain. b. Is the mixing of acetone and chloroform and endothermic or exothermic process under the above given conditions? Explain.

Explanation / Answer

According to the stoichiometry of the compound, one would predict the tetravalent state of the compound where sulfur occupies the tetrahedral voids. But in the first bonding sphere, the Fe atoms are surrounded by six S nearest neighbours in a distorted octahedral arrangement, hence it occupies octahedral voids. THe S atoms bonds with three Fe and one other S atom.

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