textbook problem 4D.23

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Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

textbook problem 4D.23

Postby Katie Bart 1I » Tue Feb 04, 2020 10:19 pm

In the solutions manual, it says that the equation we need to obtain is N2 + 5/2O2 yields N2O5. How do we know that this is the reaction we want?

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: textbook problem 4D.23

Postby Justin Sarquiz 2F » Wed Feb 05, 2020 8:03 am

For this problem, I used Hess's Law to cancel the NO2. For the final equation, I got 2 NO + 3/2 O2 ---> N205. You know the enthalpy of reaction and the enthalpy of formation for NO and the enthalpy of 02 is zero, so you can solve for the enthalpy for N205. I do not know why the answer key put that desired equation at the beginning.


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