Consider the reaction n204 → 2n02 and that дн; for n204 is 10. kj/mol ah; for no, is 34 kj/mol what is the standard enthalpy change of the reaction?

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asked Oct 12, 2024 45.5k views

1 Answer

David J Eddy · Answer 1 · 2024-10-15T22:45:34+0000

The standard enthalpy change for the reaction N₂(g) + O₂(g) → 2NO(g) is -47.7 kJ.

The standard enthalpy change of a reaction can be calculated using the enthalpy changes of the individual reactions involved.

In this case, we have the reactions:

N₂(g) + 2O₂(g) → 2NO₂(g) ΔH = +66.4 kJ

2NO(g) + O₂(g) → 2NO₂(g) ΔH = -114.1 kJ

By adding these two reactions, we can cancel out the common species (NO₂) and obtain the desired reaction:

N₂(g) + O₂(g) → 2NO(g) ΔH = ?

Adding the enthalpy changes, we get a value of +66.4 kJ - 114.1 kJ = -47.7 kJ

Therefore, the standard enthalpy change for the reaction N₂(g) + O₂(g) → 2NO(g) is -47.7 kJ.