
(a)
Interpretation:
The molar Gibbs energy of mixing when the nitrogen and oxygen are mixed to form air at
Concept introduction:
The Gibbs free energy or the free energy change is a
Molal Gibbs free energy can be determined using the following formulas as show below,
The equation for finding
(a)

Explanation of Solution
Given data:
The equation for finding
(b)
Interpretation:
The molar entropy of mixing when the nitrogen and oxygen are mixed to form air at
Concept introduction:
The equation for finding
(b)

Explanation of Solution
Given data:
The equation for finding
(c)
Interpretation:
The mixing is whether spontaneous or not has to be given.
Concept introduction:
The Gibbs free energy or the free energy change is a thermodynamic quantity represented by
Molal Gibbs free energy can be determined using the following formulas as show below,
For an isomermal reaction enthalpy change is zero, thus this equation can be written as,
(c)

Explanation of Solution
The molar Gibbs energy of mixing when the nitrogen and oxygen are mixed to form air at
The above conditions satisfies the criteria for spontaneous.
Therefore, the mixing is spontaneous.
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Chapter 4 Solutions
Elements Of Physical Chemistry
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