
Concept explainers
Interpretation: The heat of reaction for the following decomposition of rust to iron and oxygen gas needs to be determine and whether the reaction is endothermic or exothermic should be explained:
Concept Introduction: The change in enthalpy by formation of a compound in 1 mole from its constituent elements in their standard state is said to be standard heat of formation. The
Where m and n are stoichiometric numbers.

Answer to Problem SIV3RE
The heat of reaction for the decomposition of rust to iron and oxygen gas is
Explanation of Solution
The given reaction is:
The value of heat of formation of all the species involved in the reaction is:
The
Substituting the values:
Thus, the heat of reaction for the decomposition of rust to iron and oxygen gas is
Endothermic and exothermic processes are defined on the basis of energy involved. The addition of energy is endothermic whereas loss of energy is exothermic.
Since, in this process the reaction is added (indicated by positive sign of heat of reaction value) so, it is endothermic.
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