calculate the no. of iron atom in a piece of iron weighing 2.8g (atomic mass of iron =56u
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56 g of iron=6.022×10^23
1g. =6.022×10^23/56
2.8g. =6.022×10^23×2.8/56
=3.011×10^22atoms
1g. =6.022×10^23/56
2.8g. =6.022×10^23×2.8/56
=3.011×10^22atoms
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