8. Thermochemistry

Calculate the ∆Hrxn for the following thermochemical equation: 

When given the following: 

Calculate the ∆H_rxn for 

Given the following set of reactions: 

Calculate the ∆H_rxn for 

Given the following reactions:

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

Calculate the enthalpy of the reaction 4B(s) + 3O₂(g) → 2B₂O₃(s)

Calculate the enthalpy of the reaction 4B(s) + 3O₂(g) → 2B₂O₃(s).

Consider the reaction H2O(l) → H2O(g), ΔH =44.0 kJ what will ΔH be for the reaction if it is reversed?