An importantt step in the synthesis oof nitric acid is theconversion of ammonia to nitric oxide. 4NH3 (g) + 5O2 (g) = 4NO3 (g) + 6H2o (g) calculate Hrxn for this reaction if H f [NH3 (g)] = -45.9 kJ/mol H f [NO (g)] = 90.3 kJ/mol H f [H2O (g)] = -241.8 kJ/mol An importantt step in the synthesis oof nitric acid is theconversion of ammonia to nitric oxide. 4NH3 (g) + 5O2 (g) = 4NO3 (g) + 6H2o (g) calculate Hrxn for this reaction if H f [NH3 (g)] = -45.9 kJ/mol H f [NO (g)] = 90.3 kJ/mol H f [H2O (g)] = -241.8 kJ/mol
Explanation / Answer
4NH3 (g) + 5O2 (g) = 4NO3 (g) + 6H2O (g) :H = ? H = H products - Hreactants = ( 6 * H f [H2O(g)] + 4 * H f [NO3 (g)] ) - ( 4 * H f [NH3(g)] + 5 * H f [O2 (g)] ) = -906 KJ / mol