For the reduction reaction $$2no(g)+2h2(g) n2(g)+2h2o(g) which occurs at high temperatures, the experimentally determined rate law is: rate = k[no]2[h2] here is a proposed mechanism for the reduction of no by h2: elementary step 1: $$h2(g)+no(g) n(g)+h2o(g) elementary step 2: $$n(g)+no(g) n2(g)+o(g) elementary step 3: $$h2(g)+o(g) h2o(g)