Here’s A:
I divided the amount of grams of the reactants by their respective molar masses to calculate their moles. Then I used mole ratios to find how many moles I needed to solve the equation. I found that Fe was the limiting reactant.
Then to find the theoretical max. yield:
I used the limiting reactant’s (Fe) amount of grams (2.5) and divided that by its molar mass, same as before. But then I used mole ratio for FeS and then multiplied that by it’s molar mass.
I hope this makes sense it’s kind of hard to explain and easier to show a picture so here:
