4. Given the following thermochemical equations
2H2(g) + O2(g) → 2H2O(l) ∆H = -571.6 KJ
N2O5(g) + H2O(i) → 2HNO3(l) ∆H = -73.7 KJ
½ N2(g) + 3/2 O2(g) + ½ H2(g) → HNO3(l) ∆H = -174.1 KJ
Calculate ∆H for the formation of one mole of dinitrogen pentoxide from its elements in their stable state at 25oC and 1 atm.
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