How many moles of iron(III) hydroxide can be formed?

Question

if 1 mole O2 oxidizes Fe(OH)2, how many moles of Fe(OH)3 can form?

Fe(OH)2 + O2 + H20 ---->Fe(OH)3 (not balanced obviously)

Answer 1

Balanced equation: 4Fe(OH)2 + O2 + 2H2O → 4Fe(OH)3.

No. of moles of O2/No. of moles of Fe(OH)3=1:4;

Thus,  1 mole of O2 produces 4 moles of Fe(OH)3.