Using standard thermodynamic data, calculate ΔH°_rxn for the following:
2 C₂H₂ (g) + 5 O₂ (g) → 4 CO₂ (g) + 2 H₂O (l)

The oxidation of ammonia is illustrated by the following equation:

4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O (g)

Calculate the enthalpy of reaction,ΔH_Rxn, based on the given standard heats of formation.

Consider the following equation:

2 ClF₃(g) + 2 NH₃(g) → 1 N₂(g) + 6 HF (g) + 6 Cl₂(g)ΔH_rxn = –1196 kJ

Determine the standard enthalpy of formation for chlorine trifluoride, ClF₃.

N₂ + 2 O₂ → 2 NO₂
Based on the following data.
2 NO → N₂ + O₂    ΔH = −180 kJ
2 NO + O₂ → 2 NO₂    ΔH = −112 kJ