A Chemist Carries Out This Reaction in the Laboratory Using $\rightarrow$

question 26

Multiple Choice

A chemist carries out this reaction in the laboratory using 4.31 grams of zinc and an excess of sulfur: Zn + S $\rightarrow$ ZnS
From the balanced equation,she calculates that she should obtain 6.41 grams of zinc sulfide.However,she isolates only 5.01 grams of product.What is her percent yield for this reaction?

• A) 67.2%
• B) 86.0%
• C) 78.2%
• D) 128%

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