Using Hess's Law, calculate the enthalpy change for the formation of water (H₂(g) + 1/2 O₂(g) → H₂O(l)) given the following reactions: Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g) with ΔH_rxn = -385 kJ/mol and MgO(s) + 2HCl(aq) → MgCl₂(aq) + H₂O(l) with ΔH_rxn = -80 kJ/mol.

Calculate the∆Hrxnfor the following thermochemical equation:

When given the following:

Calculate the∆H_rxnfor

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