okay ap chem will be the death of me but i have a question...and its about homework lol sorryy..here it goes

(a) You are given a cube of silver metal that measures 1.000 cm on each edge. The density of silver is 10.49 g/cm cubed. How many atoms are in this cube? b) The silver atoms pack in the solid in such a way that 74% of the volume of the solid is actually filled with silver atoms. Calculate the volume of a single silver atom....Does any one know how to do this problem?

I tried part A and i`m still struggling w/ part B...for part A i have two answers which i'm not sure are right but i TRIED! either 5.855 atoms x 10^22 OR 6.317 x 10^24 atoms

if you could walk thru the problem that would be nice but any suggestions on how to do the problem itself would be very helpful! THANK YOU!