how many atoms do you have if you start with 12.9 moles?
Alot
1 mole = 6.02 x 10^23 atoms.
12.9 moles =12.9 x 6.02 x 10^23 =7.7658 x 10^24 atoms.
By the way, 12.9 moles of Uranium 238 will weigh about:12.9 x 238=~3,070.2 grams.
