what mass in grams of FeS2 must react to form 535 grams SO2? 4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2

Answer 1

QUESTION: Do you have a periodic table in front of you? If not, then get it out!

Start with the value given, 535g SO₂

STEP 1:

Balance the equation to know what the molar ratio is between SO₂ and FeS₂. Good news! It is already done, but it is always good to check.

The molar ratio is 8mol SO₂ to 4mol FeS₂

STEP 2:

Use dimensional analysis to convert the given value in grams of SO₂, through the molar ratio of SO₂ and FeS₂, to the required value in grams of FeS₂. Ignore O₂ and Fe₂O₃ since this problem has nothing to do with them.

PLAN: g SO₂ --> mol SO₂ --> mol FeS₂ --> g FeS₂

535g SO₂ x 1mol SO₂ x 4mol FeS₂ x 120.6g FeS₂ = 501g FeS₂

64.046g SO₂ 8mol SO₂ 1mol FeS₂

STEP 3:

Check your work!