Calculate δh∘ in kilojoules for the reaction of ammonia nh3 (δh∘f=−46.1kj/mol) with o2 to yield nitric oxide (no) (δh∘f=91.3 kj/mol) and h2o(g) (δh∘f=−241.8kj/mol), a step in the ostwald process for the commercial production of nitric acid.

4nh3(g)+5o2(g)→4no(g)+6h2o(g)