4FeS2 + 11O2 -> 2Fe2O3 + 8SO2, what is the extent of reaction

4fes2-11o2-2fe2o3-8so2-what-is-the-extent-of-reaction

4FeS2 + 11O2 -> 2Fe2O3 + 8SO2, what is the extent of reaction if 512 grams of SO2 is produced?

A. 1

B. 2

C. 3

D. 4

I got this question during an online exam.

Origin of the question is Stoichiometry Applications Terminology topic in section The Chemical Reaction Equation & Stoichometry, Material Balances for Processes Involving Reaction and Multiple Units of Basic Chemical Engineering

The correct option is A. 1

The explanation: Moles of SO2 = 512/64 = 8, => Extent of reaction = (8 – 0)/8 = 1.