Determine H for N2 + O2 -> 2NO with Given Information

  • Thread starter Soaring Crane
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In summary, the heat of the reaction between Fe2O3 and CO to form CO2 and Fe3O4 is -109 kJ. Using this information and the given heat values for other reactions, the heat for the reaction between N2 and O2 to form 2NO is 178.3 kJ.
  • #1
Soaring Crane
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Given the following information:
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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  • #2
Any volunteers?

Thanks again.
 
  • #4
Soaring Crane said:
Any volunteers?

Thanks again.
I get the same numbers on both problems. You're doing good.
 

1. What is the meaning of the notation "H" in the chemical equation N2 + O2 ->2NO?

The notation "H" represents the change in enthalpy, or heat content, of the reaction. It is a measure of the energy released or absorbed during a chemical reaction.

2. How do you find the value of H for a chemical reaction like N2 + O2 ->2NO?

The value of H can be determined experimentally using a calorimeter. The reaction is carried out and the change in temperature is measured. From this, the heat released or absorbed can be calculated, which is equal to H.

3. What factors can affect the value of H for a reaction like N2 + O2 ->2NO?

The physical state of the reactants and products, as well as the temperature and pressure of the reaction, can all affect the value of H. Additionally, any changes in the conditions of the reaction, such as the presence of a catalyst, can also alter the value of H.

4. How is the sign of H determined for a chemical reaction like N2 + O2 ->2NO?

The sign of H is determined by the direction of the reaction. If the reaction is exothermic, meaning it releases heat, H will be negative. If the reaction is endothermic, meaning it absorbs heat, H will be positive.

5. Can H be used to predict the spontaneity of a reaction like N2 + O2 ->2NO?

Yes, H can be used, along with the change in entropy (S) and temperature (T), to determine the spontaneity of a reaction using the equation G = H - TS. If G is negative, the reaction is spontaneous, while a positive G indicates a non-spontaneous reaction.

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