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The thermal effect of water formation reaction is 286 kJ. what will be the thermal effect of its decomposition. Why?

Respuesta :

nkirotedoreen46

Answer:

286 kJ

Explanation:

  • The heat change value in the forward reaction is equal to the heat change value in the reverse reaction.
  • The only thing that changes is the sign on the heat value, such that if the forward reaction is endothermic then the reverse reaction is exothermic.

In this case;

  • The enthalpy change of formation of water is -286 kJ/mol, this means that the reaction of formation of water is an exothermic reaction.
  • The decomposition of water which is the reverse of formation has an enthalpy change of +286 kJ, the reaction is an endothermic reaction.
  • Therefore, the thermal effect of decomposition of water has the same value as the the thermal effect of formation which is 286 kJ

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