Which reaction is exothermic?
CH4 + 2O2 - - >CO2 + 2H2O + 891 kJ
NH4NO3 + H2O + 25 kJ - - > NH4 + (aq) + NO3 - (aq)
2H2O + 286 kJ - - > 2H2 + O2
N2 + O2 + 181 kJ-->2NO
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