An importantt step in the synthesis oof nitric acid is theconversion of ammonia

Question

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

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