A sample of aluminum metal containing 9.1080 x 10 to the 25 power atoms is drawn into a cylindrical wire with radius r=0.833 mm. how long must the wire be in meters?

Answer 1

mols Al = 9.1080E25 atoms/6.0221E23 = ?
mols Al x atomic mass = grams Al
Look up the density Al. volume = grams/density.
Then volume = pi*(r^2)*h
You know pi, r, and volume. Solve for h = length of the wire.Note that I would change r to meters so the answer will be in meters.