Problem: Common brass is a copper and zinc alloy containing 37.0% zinc by mass and having a density of 8.48 g/cm3. A fitting composed of common brass has a total volume of 112.5  cm3. How many atoms (copper and zinc) does the fitting contain? 

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Common brass is a copper and zinc alloy containing 37.0% zinc by mass and having a density of 8.48 g/cm3. A fitting composed of common brass has a total volume of 112.5  cm3. How many atoms (copper and zinc) does the fitting contain? 

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