I am having trouble with part of a question. I understand molar fractions, but I

Question

I am having trouble with part of a question. I understand molar fractions, but I am caught on this one part of the equation the book did not explain. If I have reaction: 2NO2(g) --->N2O4(g) with total 0.330 moles, why is the relation n(NO2) + 2n(N2O4) = 0.33mol? The example in the book does not go into detail about why there is a 2n(N2O4). I would figure that there are 2 moles NO2 to 1 mole N2O4, yet the book is giving me the relation I presented in the beginning of this question. May someone please explaine to me why I must multiply N2O4 by 2 when adding total moles. Thank you!

Explanation / Answer

this is the only right answer please rate only this Mole fraction is the number of moles of a substance divided by the total number of moles in the solution. == Mole Fraction = == (moles of substance A )/(Total Moles of solution ) total moles dont mean the moles of the final product but the sum of all the moles of the reactants and the product.. mole fraction = (moles of individual compound) / total moles..

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