We can use the following equation to solve for ΔH˚_{rxn}:

$\overline{){\mathbf{\Delta H}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\Delta H}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{prod}}{\mathbf{-}}{\mathbf{\Delta H}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{react}}}$

**Balanced reaction: 3 NO _{2}(g) + H_{2}O(l) → 2 HNO_{3}(aq) + NO(g)**

Use standard enthalpies of formation to calculate ΔH˚_{rxn} for the following reaction: 3 NO_{2}(g) + H_{2}O(l) → 2 HNO_{3}(aq) + NO(g)

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