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Question

Which has more number of atoms,100 g of silver or 100 g of iron?

(Atomic masses:Fe=56u,Ag=108u).


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Solution

NumberofmolesofAg=Massofsilver(g)Molarmassofsilver(g/mol)=100108=0.926moleNumberofmolesofFe=Massofiron(g)Molarmassofiron(g/mol)=10056=1.786moleTherefore,wefindthat100gramsofironcontain1.786molesofatomswhereas100gramsofsilvercontains0.926molesofatoms.Sincegreaterthenumberofmoles,greateristhenumberofatomspresent.As1.786>0.926,Hence,ironwillcontaingreaternumberofatomsthansilveratom.


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