
Concept explainers
Interpretation: The theoretical yield of iron(II) sulfide should be calculated when 5.25 g of iron fillings are combined with 12.7 g of sulfur.
Concept introduction: The ratio of mass of substance to its molar mass is said to be number of moles of that substance.

Answer to Problem 48A
Explanation of Solution
The balanced complete chemical equation for the formation of iron(II) sulfide from iron and sulfur is:
The number of moles of both the reactants are calculated using formula:
The molar mass of Fe and S is 55.845 g/mol and 32.065 g/mol respectively.
Substituting the values:
From the balanced
Now, the theoretical yield of iron(II) sulfide is calculated as:
The molar mass of iron(II) sulfide is 87.92 g/mol. So,
Hence, the theoretical yield of iron(II) sulfide is
Chapter 9 Solutions
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