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2015-08-14T06:42:25+05:30

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One mole of any gas has avagadro no.of atoms
that is 6.023×10^23
no.moles of iron = mass/ molar mass
= 560/56
=10 moles
hence no. of atoms in 10 moles of Fe is 10×6.023×10^23
6.023×10^24 atoms
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