he Ostwald process for the commercial production of nitric acid from ammonia and oxygen involves the following steps:
4NH3(g)+5O2(g)⟶4NO(g)+6H2O(g)
2NO(g)+O2(g)⟶2NO2(g)
3NO2(g)+H2O(l)⟶2HNO3(aq)+NO(g)
Write the overall equation for the production of nitric acid by the Ostwald process by combining the preceding equations. (Water is also a product.) Is the overall reaction exothermic or endothermic?