Based on the stoichiometry of the reaction, 15.27 g of Sulfur are required to produce 42.0 g of FeS.
What is stoichiometry of a reaction??
A stoichiometry of a reaction shows the ratio in which reactant molecules will combine to form products.
The balanced equation of the reaction is given below:
Fe + S -----> FeS
Molar mass of sulfur = 32 g
molar mass of iron = 56 g
molar mass of FeS = 88 g
32 g of sulfur produces 88 g of FeS
mass of sulfur that will produce 42.0 g of FeS = 32/88 * 42 = 15.27 g
Therefore, 15.27 g of Sulfur are required to produce 42.0 g of FeS.
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