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 brass has a total volume of 122.5 cm3 .

How many atoms of copper does the fitting contain?

How many atoms of zinc does the fitting contain?

Answer 1

To find the number of atoms of each element in the fitting, calculate the mass of copper and zinc using their mass percentages and volume of fitting. Then, use the molar mass of each element to find the number of atoms.

Step-by-step explanation:

In order to determine the number of atoms of copper and zinc in the fitting, we need to first calculate the mass of each element using the given mass percentages and total volume of the fitting.

For copper, we can calculate the mass by multiplying the total volume by the density of brass (8.48 g/cm3) and by the mass percentage of copper (63.0%).

For zinc, we can use the same process, but multiplying by the mass percentage of zinc (37.0%).

Once we have the masses of copper and zinc, we can use the molar mass of each element and Avogadro's number to determine the number of atoms for each element.