1/2 N₂(g) + 1/2 O₂(g) → NO(g) kJ/mol-rxn Enthalpy change =

Chemistry: Principles and Practice
3rd Edition
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Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
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Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.41QE
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Enthalpy changes for the following reactions can be determined
experimentally:
N₂ (g) + 3 H₂(g) → 2 NH3(g)
ΔΗ°
-91.8 kJ/mol-rxn
4 NH3(g) + 5 O2 (g) → 4 NO(g) + 6 H₂O(g)
Δ,
A, H = -906.2 kJ/mol-rxn
H₂(g) + 1/2 O₂(g) → H₂O(g)
A, H° = -241.8 kJ/mol-rxn
=
Use these values to determine the enthalpy change for the
formation of NO(g) from the elements (an enthalpy change
that cannot be measured directly because the reaction is
reactant-favored).
1/2 N₂(g) + 1/2O2(g) → NO(g)
kJ/mol-rxn
Enthalpy change
Transcribed Image Text:Enthalpy changes for the following reactions can be determined experimentally: N₂ (g) + 3 H₂(g) → 2 NH3(g) ΔΗ° -91.8 kJ/mol-rxn 4 NH3(g) + 5 O2 (g) → 4 NO(g) + 6 H₂O(g) Δ, A, H = -906.2 kJ/mol-rxn H₂(g) + 1/2 O₂(g) → H₂O(g) A, H° = -241.8 kJ/mol-rxn = Use these values to determine the enthalpy change for the formation of NO(g) from the elements (an enthalpy change that cannot be measured directly because the reaction is reactant-favored). 1/2 N₂(g) + 1/2O2(g) → NO(g) kJ/mol-rxn Enthalpy change
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