Acetylene Gas May Be Produced by Carefully Adding Water to Calcium

question 56

Multiple Choice

Acetylene gas may be produced by carefully adding water to calcium carbide, according to the equation: CaC₂(s) + 2 H₂O(l) → Ca(OH) ₂(s) + C₂H₂(g)
When a 37 g sample of an impure calcium carbide was treated with excess water, 13 g of acetylene gas was produced. If the reaction is essentially 100% efficient, what was the percentage of nonreacting impurity in the carbide sample?

• A) 86%
• B) 58%
• C) 42%
• D) 35%
• E) 13.5%

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