What will be the number of atoms in 0.750 gram of Fe

8.085x10²¹ atoms

Explanation:

Atomic mass of Fe = 55.845 g/mol

it means,

1 mole Fe = 55.845 g

1 mole = 6.02x10²³ atoms

so,

55.845g Fe has = 6.02x10²³ atoms

∴0.750 g Fe has = { (6.02x10²³ x 0.750) / 55.84} atoms

=8.085x10²¹ atoms