Calculate the mass fraction (%) of sulfur in the pyrite FeS2.
| September 27, 2021 | education
Formula for calculating the mass fraction of an element in a substance:
w = n * Ar (chemical element) / Mr (substance), where n is the number of atoms of a given chemical element.
1) Find the relative molecular weight of the substance (FeS2):
Mr (FeS2) = Ar (Fe) + 2 * Ar (S) = 56 + 64 + 2 = 120
2) Find the mass fraction of this element in the substance:
w (S) = 64/120 = 0.53 or 53%
Answer: Mass fraction of sulfur in pyrite FeS2 is 53%.
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