The subscript is mentioned only in a chemical formula.
3 FeCl3 in a chemical reaction is not similar to Fe3O4 in a chemical formula.
The balanced equation is 3 Fe3O4 + 8 Al -> 4 Al2O3 + 9 Fe. Therefore, the coefficient of Fe is 9.
3FeO4 + 8Al --> 3Fe + 4Al2O3
Fe2O3 + 2Al --> Al2O3 + 2Fe
The 2010 Hyundai Santa-FE has a drag coefficient of .38 Cd.
The 2008 Hyundai Santa-FE has a drag coefficient of .38 Cd.
The 2007 Hyundai Santa-FE has a drag coefficient of .38 Cd.
The 2011 Hyundai Santa-FE has a drag coefficient of 0.38 Cd.
The 2009 Hyundai Santa-FE has a drag coefficient of .38 Cd.
The coefficient of Fe2O3 is 1
potassium bromide - KBr iron (III) sulfate - Fe[subscript 2](SO[subscript 4])[subscript 3] copper (II) chloride - CuCl[subscript 2] tetraphosphorous heptanitride - P[subscript 4]N[subscript 7] ammonium carbonate - (NH[subscript 4])CO[subscript 3]
This is a balanced chemical equation.
This reaction is:Al + Fe2O3 = Al2O3 + Fe