Nitric acid, required in the production of nitrate fertilizers, is produced from ammonia by the Ostwald process. Predict the standard enthalpy change for each reaction in the process, as written, and then predict the standard molar enthalpy of reaction for the first reactant listed in each equation.
a. 4NH₃ (g) + 5O₂ (g) → 4NO (g ) + 6 H₂O ( g)
b. 2NO (g) + O₂ (g) → 2 NO₂( g)
c. 3NO₂ (g) + H₂O ( l) → 2 HNO₃( l) + NO (g)