How to calculate Extent of a Reaction ?

This is just a sample problem for finding the Extent of a reaction ,keep solving more and more problems for better understanding :)
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Ok

[@ayeshaaftab6227]

Hi can u plz tell the name of the book u took the equation from

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Page number 526 , Book Chemical Engineering Thermodynamics by Smith ,Van Ness , Abbott. All the best to you @ayesha