Which of the following equations represents an exothermic reaction? (select all that apply.) nh3(g) + 12.0 kcal â½n2(g) + 3/2 h2(g) c(graphite) c(diamond), h = - 0.45 kcal c + 2s cs2, h = 27,550 cal ch4 + 2o2 co2 + 2h2o + 212,800 cal 2h2o 2h2 + o2, h = +58 kcal

CH₄ + 2O₂ ⟶ CO₂ + 2H₂O + 212 800 cal

Step-by-step explanation:

CH₄ + 2O₂ ⟶ CO₂ + 2H₂O + 212 800 cal  

The heat is on the right-hand side of the equation, so the reaction is releasing heat.

The reaction is exothermic.

A is wrong. Your sign of ΔH is wrong, because graphite is the more stable form of carbon. We must add energy to graphite to convert it to diamond, so the process is endothermic.

B and D are wrong, because a ΔH > 0 indicates an endothermic reaction.

the answer is the first option

explanation:

just googled it m8. not that hard

lol