Calculate ΔH for: N₂(g) + 2 O₂(g) → 2 NO₂(g).
What is ΔH for the overall reaction?
- A
+292 kJ
- B
−292 kJ
- Ccheck_circle
+68 kJ
- D
−68 kJ
Explanation
Add (1) + (2): N₂ + 2 O₂ → 2 NO₂. ΔH = +180 + (−112) = +68 kJ.
Hess's Law
AP Chemistry· difficulty 4/5
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