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Calorimetry moles question

I dont understand which moles value i need to calculate when trying to figure out enthalpy change of formation...i.e. (-) q/n

I calculate the wrong one ( KI ) how was i supposed to know which one to calculate in future questions and for this one- Pb(NO3)2
20180530_021134-compressed.jpg.jpeg
Original post by Yme2day
I dont understand which moles value i need to calculate when trying to figure out enthalpy change of formation...i.e. (-) q/n

I calculate the wrong one ( KI ) how was i supposed to know which one to calculate in future questions and for this one- Pb(NO3)2
20180530_021134-compressed.jpg.jpeg


You must use the limiting reagent (the one that's used up first)

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