Ask Question
17 May, 11:11

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 112.5cm^3. How many atoms of copper and zinc does the fitting contain?

+2
Answers (1)
  1. 17 May, 12:35
    0
    First, determine the mass of the alloy by multiplying the density and volume.

    m = (8.48 g/cm³) (112.5 cm³) = 954 g

    The mass of zinc in this alloy is,

    (954 g) (0.37) = 352.98 g

    mass of copper,

    954 g - 352.98 g = 601.02 g

    Then, calculate the number of moles of zinc and copper present by dividing its mass with the molar mass. The molar mass of zinc is 65.38 g/mol and that of copper is 63.55 g/mol

    n (zinc) = 352.98 g / (65.38 g/mol) = 5.40 moles

    n (copper) = 601.02 g / (63.55 g/mol) = 9.46 moles

    The number of atoms of copper and zinc are determined by multiplying the number of moles with the Avogadro's number and the answers are,

    atoms (zinc) = 3.25 x 10^24 atoms

    atoms (copper) = 5.70 x 10^24 atoms
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “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 ...” in 📘 Chemistry if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers