In the industrial manufacture of nitric acid by the Ostwald process, ammonia gas (NH3\text{NH}_3NH3) is oxidised over a platinum-rhodium catalyst to produce nitrogen monoxide gas (NO\text{NO}NO) and water vapour (H2O\text{H}_2\text{O}H2O).
Which of the following represents the correctly balanced chemical equation for this reaction?
2NH3(g)+2O2(g)→2NO(g)+3H2O(g)2\text{NH}_3(\text{g}) + 2\text{O}_2(\text{g}) \rightarrow 2\text{NO}(\text{g}) + 3\text{H}_2\text{O}(\text{g})2NH3(g)+2O2(g)→2NO(g)+3H2O(g)
4NH3(g)+3O2(g)→4NO(g)+6H2O(g)4\text{NH}_3(\text{g}) + 3\text{O}_2(\text{g}) \rightarrow 4\text{NO}(\text{g}) + 6\text{H}_2\text{O}(\text{g})4NH3(g)+3O2(g)→4NO(g)+6H2O(g)
NH3(g)+O2(g)→NO(g)+H2O(g)\text{NH}_3(\text{g}) + \text{O}_2(\text{g}) \rightarrow \text{NO}(\text{g}) + \text{H}_2\text{O}(\text{g})NH3(g)+O2(g)→NO(g)+H2O(g)
4NH3(g)+5O2(g)→4NO(g)+6H2O(g)4\text{NH}_3(\text{g}) + 5\text{O}_2(\text{g}) \rightarrow 4\text{NO}(\text{g}) + 6\text{H}_2\text{O}(\text{g})4NH3(g)+5O2(g)→4NO(g)+6H2O(g)