converting from moles to molecules

converting 2 moles of Au

like converting distance:
  
2 mol x 6.02x10^23 
                  1 mol

the mole's cancel each other out so you get  

2      x 6.02x10^23      = 12.01x10^23    = 12.0x10^23
                   1


you multiply and then convert to significant digits.

-Paul Dinh