textbook problem 4D.23

Moderators: Chem_Mod, Chem_Admin

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.

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 3 guests