Question 213360
mass  of  63.5 g = 6.02x10^23 atoms 
.
to  find x g = 1 atom ,,,,,,,divide  both  sides  of  original  eqn  by  6,02 x 10^23
.
63.5 g / 6.02x10^23 = 1.0548 x 10^-22 g = 6.02 x10^23/6.02 x 10^23 = 1 atom
.
answer  is one  atom  has  mass  of  1.0548 x 10^-22 g
.