Calculate the number of formula units of Fe3O4 needed if 81.560 grams of aluminum are reacted

6.8266x10²³ formula units of Fe₃O₄ are needed

Explanation:

The reaction of Fe₃O₄ with Al occurs as follows

3Fe₃O₄ + 8Al → 4Al₂O₃ + 9Fe

Where 3 moles of Fe₃O₄ react with 8 moles of Al

To know the number of formula units of Fe3O4 needed for a complete reaction with Al we need to convert the mass of Al to moles in order to find the moles of Fe₃O₄ and the formula units:

Moles Al -Molar mass: 26.98g/mol-:

81.560g Al * (1mol / 26.98g) = 3.0230moles Al

Moles Fe₃O₄:

3.0230moles Al * (3 mol Fe₃O₄ / 8 mol Al) = 1.1336mol Fe₃O₄

Formula units of Fe₃O₄:

1.1336mol Fe₃O₄ * (6.022x10²³ FU / mol) =

i think its 100.

hope this !