Print Page - AP chemistry Question - Hess's law -Oswald equation

Title: AP chemistry Question - Hess's law -Oswald equation
Post by: Siba on January 29, 2026, 06:05:00 PM

I can't figure out the formula for this problem, NO should cancel out.
Screenshot 2026-01-29 at 5.57.45 PM.png

Title: Re: AP chemistry Question - Hess's law -Oswald equation
Post by: uma on January 31, 2026, 07:11:25 AM

To show water and NO as the product
I will take equation 1 as such and will multiply eq 2 with 3/2 and eq3 as such and then add them together
Final equation will be
8NH3 + 13O2 ---> 4NO + 4HNO3 + 10H2O
∆H = -905 -3/2(112)-138 = -1211kJ
Rxn is exothermic

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Chemistry Homework Help => AP Chemistry => Topic started by: Siba on January 29, 2026, 06:05:00 PM