The density of aluminum is 2.70 g/cm3. Apiece of aluminum foil that is 1000 cm on each side has a mass of 440. mg. How thick is the piece of foil?

mass/volume = densitymass = (440 mg)*(1g)/(1000mg) = 0.440gvolume = (1000cm)(1000cm)(t) where t = thicknessdensity = 2.70 g/cm^3 = (0.440g)/((1000cm)(1000cm)(t))multiply both sides by 't' and divide both sides by (2.70g/cm^3)t = (0.440) / ((1000cm)(1000cm)(2.70)) = 1.629x10^-7 cmt = (1.629 x 10^-7 cm)*(1000000 micrometers)/(1 cm) = 0.1629 micrometersAnswer is t = 0.1629 micrometers