1) How thick is the foil? You will not be able to measure it, so you'll need to brainstorm some other method.

Question

2) How many atoms are in the sample? Please be sure to show your work.

Answer 1

To find the thickness you need to use the density of Al (2.70 g/cm^3) and the measured mass to calculate the volume of Al present in your sample. D = m / V

Then measure the length and width of the Al foil square. Mult to get area. V = L x W x T or V = A x T.

Once you calculate the volume and area divide the V by A to get T. It will be very small (10^-3 cm)

Use mass to convert given sample to moles Al (grams of sample divided by 27 = moles Al) Mult moles by Avogadro's number (6.02 x 10^23) to get number of atoms.