Posted by Reg on Thursday, September 20, 2012 at 7:26pm.
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, Thursday, September 20, 2012 at 7:36pm
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, Thursday, September 20, 2012 at 8:30pm
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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