What volume of copper (

Question

density 8.96 g/cm3
)
would be needed to balance a 1.15 cm3 sample of lead (
density 11.4 g/cm3
)
on a two-pan laboratory balance?

Answer 1

mass = density * volume, so since the two masses must be equal, the volume v we want is found by

8.96v = 11.4*1.15

Answer 2

4.15