Mole ConceptHard

Question

Equal masses of iron and sulphur are heated together to form FeS. What fraction of the original mass of excess reactant is left unreacted? (Fe = 56, S = 32)

Options

A.0.22
B.0.43
C.0.86
D.0.57

Solution

Fe + S → FeS

56 g 32 g

Hence, the excess reactant is sulphur and the mass fraction of sulphur remained =$\frac{56 - 32}{56} = 0.4285$= 0.4285.

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