Enthalpy change of solution of Na2CO3 is a _ reaction.
Correct answer: A. Exothermic
- A. Exothermic
- B. Endothermic
- C. Spontaneous
- D. Non-spontaneous
Explanation
The enthalpy change of solution of sodium carbonate is -24.6kJ.mol-1. Since enthalpy change is negative, the reaction is exothermic. However, since the entropy increases, the spontaneity of the reaction depends on the temperature of the system. Therefore, it can not be stated for sure whether the reaction is spontaneous or non-spontaneous.
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About Exothermic and Endothermic Reactions
Exothermic reactions release heat to the surroundings and have negative enthalpy change, while endothermic reactions absorb heat and have positive enthalpy change. The topic uses energy profiles to identify reactants, products and activation energy, and includes bond energy, enthalpy diagrams, calorimetry and Hess's law for calculating overall heat changes.
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