Can anyone show me how to solve this
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Can anyone show me how to solve this

[From: ] [author: ] [Date: 12-09-04] [Hit: ]
7 + 9.7 = -58.http://www.chemteam.......
Given the following data

N2(g) + 2O2(g) ---> 2NO2(g) Δ H = 67.7 kJ
N2(g) + 2O2(g) ---> N2O4(g) Δ H = 9.7 kJ

Calculate Δ H for the dimerization of NO2: 2NO2(g) ---> N2O4

The answer is -58.0 kJ

Any help at all would be greatly appreciated, I have been stumped on this for a long long time!

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Flip the first equation and leave the second one alone. The result:

2NO2(g) ---> N2(g) + 2O2(g) Δ H = -67.7 kJ
N2(g) + 2O2(g) ---> N2O4(g) Δ H = 9.7 kJ

When you add the two equations, the N2 and the 2O2 cancel, leaving you with your target equation.

When we add equations, we add their enthalpies:

-67.7 + 9.7 = -58.0 kJ

More like this:

http://www.chemteam.info/Thermochem/Hess…
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