Chemistry
Solutions
Chemistry
Given the values of ∆H and ∆S, which of the following changes will be spontaneous at constant T and p?
a. ∆H = + 25 kJ, ∆S = + 5.0 J/K, T = 300. K
b. ∆H = + 25 kJ, ∆S = + 100. J/K, T = 300. K
c. ∆H = − 10. kJ, ∆S = + 5.0 J/K, T= 298 K
d. ∆H = − 10.kJ, ∆S =−40.J/K, T = 200.K
(a)
Interpretation: The spontaneous change in each case is to be predicted at constant temperature and pressure.
Concept introduction: The expression for free energy change is,
A reaction is said to be spontaneous if the value of
Explanation
Given
The value of
The value of
Temperature is
The conversion of kilo-joule
Hence,
The conversion of
Formula
The formula of
Where,
(b)
Interpretation: The spontaneous change in each case is to be predicted at constant temperature and pressure.
Concept introduction: The expression for free energy change is,
A reaction is said to be spontaneous if the value of
(c)
Interpretation: The spontaneous change in each case is to be predicted at constant temperature and pressure.
Concept introduction: The expression for free energy change is,
A reaction is said to be spontaneous if the value of
(d)
Interpretation: The spontaneous change in each case is to be predicted at constant temperature and pressure.
Concept introduction: The expression for free energy change is,
A reaction is said to be spontaneous if the value of
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