One of the steps in the manufacture of nitric acid is represented by the equation 3NO2(g) + H2O(l) → — Thermodynamics Chemistry Question

One of the steps in the manufacture of nitric acid is represented by the equation
3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)
for which ∆H° = –136.5 kJ/mol. Determine ∆H°formation for NO₂ in kJ/mol.