Verified Answer :

The reaction 4al (s) 3o2 (
g. → 2al2o3 (s) δh° = -3351 kj is exothermic________, and therefore heat is _____release ___ by the reaction.

Answer: The reaction is exothermic and therefore the heat is released by the reaction.

Explanation:

There are 2 types of reaction based on the heat of the reaction:

  • Exothermic reactions are defined as the reactions in which energy is released in the form of heat. The enthalpy change \((\Delta H^o)\) of the reaction comes out to be negative for this kind of reaction.
  • Endothermic reactions are defined as the reactions in which energy is absorbed in the form of heat. The enthalpy change \((\Delta H^o)\) of the reaction comes out to be positive for this kind of reaction.

For the given chemical reaction:

\(4Al(s)+3O_2(g)\rightarrow 2Al_2O_3(s);\Delta H^o=-3351kJ\)

As, the enthalpy change of the reaction is negative. The reaction is considered as an exothermic reaction.

Hence, the reaction is exothermic and therefore the heat is released by the reaction.

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