To identify:
Which of the given reactions is spontaneous i) Only at low temperature ii) Only at high temperature iii) at all temperatures.
Answer to Problem 12.63QA
Solution:
a)
b)
c)
Explanation of Solution
To know if a reaction is spontaneous, we need to find out
a)
i. Change in enthalpy of reaction i.e.
From the appendix 4, the values of standard molar enthalpies are,
Therefore,
ii. Change in entropy of reaction i.e.
From the appendix 4, the values of standard molar entropies are,
Therefore,
iii. The Gibb’s free energy change for reaction,
According to the above equation when both
b)
i. Change in enthalpy of reaction i.e.
From the appendix 4, the values of standard molar enthalpies are,
ii. Change in entropy of reaction i.e.
From the appendix 4, the values of standard molar entropies are,
iii. The Gibb’s free energy change for reaction,
According to the above equation when both
c)
i. Change in enthalpy of reaction i.e.
From the appendix 4, the values of standard molar enthalpies are,
ii. Change in entropy of reaction i.e.
From the appendix 4, the values of standard molar entropies are,
iii. The Gibb’s free energy change for reaction,
According to the above equation when
Conclusion:
Using change in enthalpy and entropy of reaction, sign of Gibb’s free energy can be found out.
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