4NH3(g) + 5O2(g) <--> 4NO(g) + 6H2O(g) if H = -950kJmol-1, does that mean it's an exothermic reaction? Ooops pressed Post too quickly. Yes it is exothermic. Delta H is negative so heat is lost from the system. If delta H is positive a reaction is endothermic as it is gaining heat.
1. 4 NH3 (G) + 5 O2(G) 4 NO (G) + 6H2O(G)
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