How many moles of oxygen, are needed to react with excess propane, C3H8, to produce 15.0 moles of water?

1 mole of C3H8 reacts with __five__ moles of O2 to produce __three__ moles of CO2 and  of H2O.

Explanation:

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.