PLEASE HELP! IM BEING TIMED! 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

Which describes interactions between substances and stomata during photosynthesis? check all that apply. oxygen enters stomata. oxygen is released through stomata. carbon dioxide enters stomata. carbon dioxide is released through stomata. hydrogen enters stomata. hydrogen is released through stomata.

How does a hydroelectric power plant converts energy into energy.

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?