AP Chemistryeasymcq1 pt
A 25.0 g sample of pure copper(II) sulfide contains 16.6 g of copper. How much copper does a 50.0 g sample of the same compound contain?
A.33.2 g
B.16.6 g
C.66.4 g
D.8.30 g
Explanation
Core Concept
A pure compound keeps the same mass percent of each element in every sample. Here copper is 16.6 ÷ 25.0 = 66.4% of the sample, so doubling the sample doubles the copper to 33.2 g. Composition scales with sample size because the chemical formula is fixed.
Correct Answer
A33.2 g
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