Interpretation:
The sign of ΔH for the crystallization of sodium acetate from a concentrated solution is to be determined. Also, whether the reaction is exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In
In chemical reactions, the change in enthalpy (ΔH) is the difference in the energy of the product and reactant. The general expression to calculate ΔH is,
ΔH=HProduct−HReactant (1)
Here,
ΔH is the change in enthalpy of the system.
HProduct is the enthalpy of the products.
HReactant is the enthalpy of the reactants.
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of the product. HProduct is greater than HReactant in the endothermic reactions.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product. HReactant is greater than HProduct in the exothermic reactions.
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Chemistry: The Molecular Nature of Matter and Change
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