Monday
April 21, 2014

Homework Help: chemistry

Posted by Megan on Sunday, September 19, 2010 at 10:19pm.

2 NO2(g) N2(g) + 2 O2(g)

The ΔH for the reaction above is -66.4 kJ. The system is initially at equilibrium. What happens if N2 is added to the reaction mixture at constant temperature and volume?
The reaction absorbs energy.
The reaction releases energy.
[NO2] increases.
[NO2] decreases.
[NO2] remains constant.
[N2] increases.
[N2] decreases.
[N2] remains constant.
[O2] increases.
[O2] decreases.
[O2] remains constant.

I am so confused about how to do this. I put releases heat, NO2 increases, N2 increases, and O2 decreases.

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