Answer :

60.8/200 or 0.3 mole or 1.80×10^23 atoms are contained.

What is atom?

Atom is a particle of the matter that uniquely defined as a chemical elements.An atom is consist of a central nucleolus that is surrounded by or more negetivly changes of electrons.

One mole of element contains 6.203×10 ^ 23 atoms

And one mole measures the molar mass of compund

Here Pt molar mass is 195 g

So 97.6/195 is 0.5 mole nearly or 3.115×10^23 atoms

Then gold Au molar mass is 197 g nearly

So 50.5/197 is 0.25 mole and 1.50×10^23 atoms

Then mercury Hg molar mass is 200 nearly and here

60.8/200 or 0.3 mole or 1.80×10^23 atoms

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