In this case you have unlimited iron, but only 6.40 moles of oxygen (O2). How much Fe2O3 can you produce?

682 grams

Explanation:

The balanced chemical reaction is:

is the limiting reagent as it limits the formation of product and is the excess reagent.

According to stoichiometry :

3 moles of produce = 2 moles of

Thus 6.40 moles of will produce=  of

Mass of

Thus 682 g of will be produced from 6.40 moles of oxygen

gravity causes stares to cluster i think so