Industrial production of nitric acid, which is used in many products including fertilizers and explosives, approaches 10 billion kg per year worldwide. the first step in its production is the exothermic oxidation of ammonia, represented by the following equation. 4 nh3(g) + 5 o2(g) → 4 no(g) + 6 h2o(g) δh⁰rxn = −902.0 kj if this reaction is carried out using 7.056 ✕ 103 g nh3 as the limiting reactant, what is the change in enthalpy?