A box contains a mixture of small copper spheres and small lead spheres. The total volume of both metals is measured by the displacement of water to be 426 cm3 and the total mass is 4.31 kg .
What percentage of the spheres are copper?
We are being asked to calculate the percentage of copper spheres in the mixture.
We are given: total mass = 4.31 kg and total volume = 426 cm3
massCu + massPb = 4.31 kg
VolumeCu + VolumePb = 426 cm3
We can relate mass and volume using density.
Recall: Density represents the mass of an object or compound within a given volume.