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Consider the reaction of Copper with Sulfur: Cu +S → Cus. Using the
below data, which of following is true?

A. Sulfur was the limiting reactant; 1.61 g of sulfur were reacted.
B. Copper was the limiting reactant; 1.32 g of sulfur were unreacted
C. Copper (II) sulfide was the limiting reactant; 4.78 g was formed.
D. There was no limiting reactant; both reactants remained in excess.

Consider the reaction of Copper with Sulfur Cu S Cus Using the below data which of following is true A Sulfur was the limiting reactant 161 g of sulfur were rea class=

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Answer:

B. Copper was the limiting reactant; 1.32 g of sulfur were unreacted

Explanation:

Cu + S → CuS

  • As there was no Cu left after the reaction was completed, Cu was not the reactant in excess but rather the limiting reactant.
  • Copper (II) sulfide (CuS) cannot be the limiting reactant, because it is not a reactant but a product.

With the two points above in mind, the only option left is B.

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