1.

1.68 g iron contains how many moles of iron? Calculate, the number of atoms in same amount of iron. (At. mass of Fe = 56).

Answer»

Number of moles = mass of substance/mass of one mole
\(\frac{1.68}{56}\) = 0.03 moles
1 mole of iron contains 6.023 × 1023 atoms
0.03 moles of iron will contain 0.03 x 6.023 × 1023  atoms
= 1.8 ×1022  atoms



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