0
you have
m = 12.5g
M = 107.9g/mol
Na = 6.02x10^23atoms/mol = avagadros number
N = ? atoms
then the number of moles is
n = m/M = N/Na
gives
N = mNa/M = 12.5*6.02x10^23 / 107.9 = 6.97 x 10^22 atoms
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