AP Chemistryeasymcq1 pt
A 5.00 g sample of brass, a copper-zinc alloy, is 70.0% copper by mass. What mass of zinc does the sample contain?
A.1.50 g
B.3.50 g
C.0.700 g
D.5.00 g
Explanation
Core Concept
Copper accounts for 0.700 × 5.00 = 3.50 g, and the two metals together must account for the whole sample. Subtracting leaves 5.00 - 3.50 = 1.50 g of zinc. Mixture percent problems reduce to applying the percentage and taking the remainder.
Correct Answer
A1.50 g
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