Chem
posted by Reg .
The mass of a cube of iron is 277 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?

Chemistry 
david
After treating a coloured solution of a compound with activated charcoal, filtering and drying the product, the colour of the product was grey. What caused the grey colour? How can the grey colour be removed?

Chem 
DrBob222
volume Fe = mass/density.
Solve for volume Fe.
mass Pb = volume x density Pb. The density of Pb is about 11.3 g/cc but you should confirm that.
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