Calculate the number of atoms present in 8 gram of iron metal
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1 mole of iron = 6.02 x 10^23 atoms = 56g
No.of moles of iron = given mass/molar mass = 8/56 = 1/7 mol
No. of atoms = 6.02 x 10^23/7 = 0.86 x 10^23
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