(density of copper = 8.95 g/cm^3)
find the amount of copper present: 4.88lb of covellite @ 66% Cu = 3.221 pounds of copper convert to grams: 3.221 pounds of copper @ 453.6 grams / pound = 1,461 grams of copper use density to find volume 1,461 grams of copper @ 8.95 g/cm^3 = 163.2 cm^3 you have lots of data with 3 sig figs... your answer rounded to 3 sig figs is 163 cm^3 of copper however since 66% only has 2 sig ifgs, you might be expected to round off to 160 cm^3 of copper
