If a square piece of aluminum foil had a density of 2.7 g/cm3 and the mass of this foul is 0.128g, what will be the thickness of the foil if the length and width are both 5.0 cm?

Question

(Hint: thickness is height in the volume formula)

Answer 1

Let x=thickness, then the volume of the foil is 25x cc.

Density=mass/volume=0.128/25x=2.7, so:

x=0.128/(25×2.7)=0.0018963cm approx.

Thickness is about 0.019mm.