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Interpretation:
For given reaction the ΔGorxn reaction value has to be calculated at 298K.
2NO(g) + Cl2(g) → 2NOCl(g)
Concept introduction:
- Enthalpy (H): it is the total amount of heat in a particular system.
- Entropy (S) : it is used to describe the disorder. It is the amount of arrangements possible in a system at a particular state. ΔSuniv = ΔSsys + ΔSsurr
- Free energy change (ΔGo): change in the free energy takes place while reactant converts to product where both are in standard state.
Enthalpy is the amount energy absorbed or released in a process.
The enthalpy change in a system (ΔΗsys) can be calculated by the following equation.
ΔHorxn = ΔH°produdcts- ΔH°reactants
Where,
ΔH°reactants is the standard entropy of the reactants
ΔH°produdcts is the standard entropy of the products
Entropy is the measure of randomness in the system. Standard entropy change in a reaction is the difference in entropy of the products and reactants (ΔS°rxn) can be calculated by the following equation.
ΔS°rxn = S°Products- S°reactants
Where,
S°reactants is the standard entropy of the reactants
S°Products is the standard entropy of the products
Standard free energy (Gibbs free energy) is the term that is used to explain the total energy content in a thermodynamic system that can be converted into work. The free energy is represented by the letter Go . All spontaneous process is associated with the decrease of free energy in the system. The equation given below helps us to calculate the change in free energy in a system.
ΔGorxn = ΔΗorxn- TΔSorxn
Where,
ΔGorxn is the change in standard free energy of the system
ΔΗorxn is the change in standard enthalpy of the system
T is the absolute value of the temperature
ΔSorxn is the change in entropy in the system
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Chapter 20 Solutions
Chemistry: The Molecular Nature of Matter and Change
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