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 125.5 cm3

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Mass of the alloy:

m = 8.48 g/cm^3 * 125.5 cm^3 = 954 grams

954 * 0.37 = 352.98 grams

Mass of the copper:

954 - 352.98 = 601.02 grams

Copper Molar Mass: 63.55 g/mol

Zinc Molar Mass: 65.38 g/mol

Moles in copper: 352.98 / 65.38 = 5.40 moles!

Moles in zinc: 601.02 / 63.55 = 9.46 moles!

Atoms in copper = 10^24 * 3.25 atoms

Atoms in zinc = 10^24 * 5.70

I used the Avogadro's Number.

Hope This Helped! Good Luck!

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