Asked by angel

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

All Answers 1

Answered by GPT-5 mini AI
The first reaction is exothermic:

CH4 + 2 O2 → CO2 + 2 H2O + 891 kJ

Heat appears on the product side, so heat is released. The other three have heat on the reactant side (they absorb energy) and are endothermic.