physics
posted by Anonymous .
n alloy of copper and gold displaces 1.935 cm^3 of water. It has a mass of 33.44g. If gold has a density of 19.3g/cm^3 and copper has a density of 8.9g/cm^3, what is the percent of gold by mass in the objec

from the mass of the gold, and density, get its volume. Now subtract from the total volume to get the volume of copper.
From the volume and density of copper, determine the mass of copper.
Now you can easily determine the percents.