Nitrogen Dioxide Formation

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904564128
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Joined: Fri Sep 25, 2015 3:00 am

Nitrogen Dioxide Formation

Postby 904564128 » Thu Jan 07, 2016 4:56 pm

On page 18 of the course reader, the example of calculating delta H for nitrogen dioxide formation is given. I am confused about the use of Hess's Law for adding together the two equations. Where does NO go? Is it not used simply because the question is asking for the formation, which only includes N2 and O2?

tianying_feng_3J
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Re: Nitrogen Dioxide Formation

Postby tianying_feng_3J » Thu Jan 07, 2016 5:02 pm

2NO is "canceled out" by adding the two equations together:
N2+O2->2NO
2NO+O2->2NO2
It's like doing a math equation, when both sides have the same things, they cancel out


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