Question

Find the heat of formation for a mole of nitrogen dioxide (NO2) given: 2N2O5(s) → 4NO2(g) + O2(g) ∆ Ho = 219 kJ N2(g) + 5/2O2(g) → N2O5(s) ∆ Ho = -43.1 kJ ∆ Ho of nitrogen dioxide (NO2) = ?