Which of the following mole ratios CANNOT be written from the following chemical equation. *
4FeS₂+ 11O₂ → 2Fe₂O₃ + 8SO₂
4 mol FeS₂ / 11 mol O₂
8 mol SO₂ / 4 mol FeS₂
2 mol O₂ / 2 mol Fe₂O₃
2 mol Fe₂O₃ / 8 mol SO₂

Question

Which of the following mole ratios CANNOT be written from the following chemical equation. *
4FeS₂+ 11O₂ → 2Fe₂O₃ + 8SO₂
  4 mol FeS₂ / 11 mol O₂
 8 mol SO₂ / 4 mol FeS₂
 2 mol O₂ / 2 mol Fe₂O₃
 2 mol Fe₂O₃ / 8 mol SO₂

anonymous · Answer

Im so confused, if anyone can help me understand how to actually complete this problem that would be great!! Thanks

kkutie7 · Answer

ok so you are given the moles for each of the molecules in the equation.
FeS2=4 moles, O2= 11moles, Fe2O3=2moles, and SO2=8 moles.
the question is asking for the ratio that cannot be made.
each ration is just a mole amount over another moles amount. you have been provided with this. your job is to find the one ratio that does not match the information you have been given.

jebonna · Answer

Ratio of moles is the numbers in front of the elements in your equation. For example, FeS2 has a '4' in front of it. and O2 has an '11' in front of it. This means A (your first option) is possible and CAN be written, as the ratios show up in your equation.

Basically, look for the numbers that do not show up in front of the elements it is referring to. Ask yourself: "Is there a '8' in front of SO2?" If there is, then you know that ratio is correct and can be written. 

Do that for every element in your multiple choice questions, and you will find your answer. :)

I hope this helps!