Answer:
6 moles of oxygen, or 3O2.
Explanation:
I would build a proportion for this:

The answer is c :) i hope its the right answer
An Exothermic reaction releases energy into the surroundings and so the products have more potential energy then the reactants. The enthalpy change is a negative value. Whereas, an endothermic reaction involves the absorption of energy into the system and so the reactants have more potential energy than the products. The enthalpy change is a positive value. This is clearly represented in energy profile diagrams.