3) Determine the value of the enthalpy change, AHıxn, for the following reaction using the information below.
N2O(g) + NO2(g) → 3 NO(g)
2 NO(g) → N2(g) + O2(g)
2 N2O(g) → 2 N2(g) + O2(g)
NO(g) + 1/2O2(g) → NO2(g)
AH=-181 kJ/mol
AH=-163 kJ/mol
AH = -57 kJ/mol

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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