How many moles of iron are needed to react with 0.125 moles of oxygen
Given; 4Fe + 3O2 = 2Fe2O3

0.167 mol Fe

Explanation:

4 Fe  +  3 O₂  ⇒  2 Fe₂O₃

Convert moles of oxygen to moles of iron using the mole ratio.  You can find the mole ratio using the chemical equation.  For every 4 moles of iron, you will need 3 moles of oxygen.

(0.125 mol O₂)  (4 mol Fe/3 mol O₂) = 0.167 mol Fe

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i