Using this reversible reaction, answer the questions below: N2O4 2NO2
(colorless) (reddish-brown)

-As the temperature increased, what happened to the N2O4 concentration?

-Was the formation of reactants or products favored by the addition of heat?

-Which reaction is exothermic? Right to left or left to right?

-If the change of enthalpy of this reaction when proceeding left to right is 14 kcal, which chemical equation is correct?

N2O4 2NO2 + 14 kcal
N2O4 2NO2, HR = +14 kcal
N2O4 + 14 kcal 2NO2
N2O4 2NO2, HR = -14 kcal