Question

Calculate the number of atoms in 16 g of iron. (at. Mass of Fe = 56) please answer me fast ​

Answer 1

$Moles\ of\ iron=\frac{Given\ mass\ of\ iron}{Atomic\ mass\ of\ iron}$

$Number\ of\ atoms=Moles.N_{a}\\ where\ N_{a} = Avogadro's\ number$

So, moles of iron here = (16/56) = 0.285

And, number of atoms = (6.022 × 10²³) × 0.286 = 1.7 × 10²³ atoms

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