How many iron atoms reacted in iron (111) hydroxide

Question

45 g sample of iron was used

Answer 1

Iron(III) hydroxide has the formula Fe(OH)₃.

The molar mass of Fe(OH)₃ is 106.9 g/mole.

45 g x 1 mole/106.9 g = 0.421 moles

moles Fe = 0.421 since 1 mole Fe(OH)3 contains 1 mole Fe

# of iron atoms = 0.421 moles Fe x 6.02x102³ atoms/mole = 2.5x102³ atoms of iron