Does iron (II) sulfide have a high melting point? Why or why not?

1 Answer
anor277
Jul 30, 2016

This site reports the melting point of #FeS# as #1188# #""^@C#.

Explanation:

This melting point is reasonably high for an ionic species; as we would expect given the #2+#, #2-# charges on each of the ions. Clearly, the sulfide is non-molecular, which accounts for the high melting point. We should, however, make the comparison with #FeO#, which is congeneric with the sulfide. This site reports the melting point as #1377# #""^@C#. Why do you think the melting point of the oxide is greater?

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