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 120.5 cm3 .How many atoms of zinc does the fitting contain?

FREE Expert Solution

We’re being asked to determine the number of atoms of zinc in a fitting containing 37.0 % by mass Zn


We know that the fitting is a common brass alloy composed of copper, Cu and Zinc, Zn.


And to do that we're going to do the following steps:


Step 1: Solve for mass of the common brass fitting (solution) using the volume and 

density of the fitting.


volume solution (density) → mass solution


Step 2:  Solve for mass of Zinc using the mass percent formula shown below:


mass percent=mass componenttotal mass×100


Since we are dealing with an alloy (solid solution), we can rewrite the equation as:


% mass=mass solutemass solution×100


Step 3: Solve for moles of Zn in fitting and # of atoms of Zn using Avogadro's number


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Problem Details

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 120.5 cm3 .

How many atoms of zinc does the fitting contain?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mass Percent Formula concept. You can view video lessons to learn Mass Percent Formula. Or if you need more Mass Percent Formula practice, you can also practice Mass Percent Formula practice problems.