A sample of aluminum foil contains 5.90×1023 atoms. What is the mass of the foil? mass: g

Answer 1

Assuming the aluminum foil is 100% aluminum (which in reality it isn't), then we have...

5.90x10²³ atoms x 1 mol Al / 6.02x10²³ atoms x 26.98 g Al / mol Al = 26.4 g Al (to 3 sig. figs.)