[tex]\frac{55.845}{119.975}[/tex] or 46.55%
Explanation:
Formula of pyrite = FeS₂
Problem:
Weight fraction of Fe in FeS₂
Solution
Atomic mass of Fe = 55.845g/mol
Atomic mass of S = 32.065g/mol
To find the weight fraction of Fe in FeS₂:
Weight fraction = [tex]\frac{atomic mass of Fe}{molar mass of [tex]FeS_{2}[/tex]}[/tex]
molar mass of FeS₂ = [55.845 + 2(32.065)] = 119.975g/mol
Weight fraction of Fe = [tex]\frac{55.845}{119.975}[/tex]
As a percentage, weight fraction of Fe = 46.55%
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