Verified Answer :

Moles = mass/atomic weight of mercury
          =      98.3/200.59
          =        0.49 moles.

Number of atoms = moles x 6.02 x 10^23
                             =    0.49 x 6.02 x 10^23
                             =       2.94 x 10^23 atoms.

Hope this helps!
                          


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