Given the following information:(adsbygoogle = window.adsbygoogle || []).push({});

Fe2O3 + 3CO -> 2Fe + 3CO2 Heat = -28.0 kJ

3Fe + 4CO2 -> 4 CO + Fe3O4 Heat =-12.5 kJ

FInd the heat for the following reaction:

Fe2O3 + CO -> CO2 + Fe3O4

Balance the equation first and remember to include the correct units.

3Fe2O3 + CO -> CO2 +2Fe3O4

Fe2O3 + 3CO --> 2Fe + 3CO2 H = -28 kJ

2(3Fe + 4CO2 --> 4CO + Fe3O4 H = -12.5 kJ)

3(Fe2O3 + 3CO --> 2Fe + 3CO2 H = -28.0 kJ)

6Fe + 8CO2 --> + 2 Fe3O4 H = -25.0 kJ

3Fe2O3 + 9CO --> 6Fe + 9CO2 H = -84.0

6Fe + 8CO2 --> 8CO + 2Fe3O4 H = -25.0 kJ

Thus,3Fe2O3 + CO -> CO2 +2Fe3O4 and H = -109 kJ??

Use the presented information to find the H for: N2 + O2 ->2NO

1/2 N2 + O2 -> NO2 H = 32.16

4NO + 2O2 ->4NO2 H = -227.9

1/2 N2 + O2 -> NO2 H = 32.16

1/2 (4NO + 2O2 ->4NO2 H = -227.9)

2(1/2 N2 + O2 -> NO2 H = 32.16)

2NO2 --> 2NO + O2 H = +113.95

N2 + 2O2 --> 2NO2 H = 64.32

2NO2 --> 2NO + O2 H = +113.95

Thus, N2 + O2 ->2NO and H = 178.27 = 178.3 ?? I suppose the units are kJ even if they didn't state which units are used?

Thanks.

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# Homework Help: Hess' Laws

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