Math Help - help please..

pure gold can be made into extremley thin sheets called gold leaf. suppose that 50. kg of gold is made into gold leaf having an area of 3620 m^2. The density of gold is 19.3 g/cm^3

a. how thick in micrometers is the gold leaf?
b. a gold atom has a radius of 1.44E-10 m, how many atoms thick is the gold leaf?

thanks in advance!

Ric

volume = (mass)(density)

volume = (area)(thickness)

so ...

(mass)(density) = (area)(thickness)

solve for thickness.

part 2 ...

# of atoms = (thickness)/(diameter of a gold atom)

remember that diameter = 2(radius)