Chemical Thermodynamics Question 36

Question: The standard entropies of $ CO_2(g),,C(s) $ and $ O_2(g) $ are 213.5, 5.690 and $ 205,J{{K}^{-1}} $ respectively. The standard entropy of formation of $ CO_2(g) $ is [CPMT 2001]

Options:

A) $ 1.86,J{{K}^{-1}} $

B) $ 1.96,J{{K}^{-1}} $

C) $ 2.81,J{{K}^{-1}} $

D) $ 2.86,J{{K}^{-1}} $

Show Answer

Answer:

Correct Answer: C

Solution:

Formation of $ CO_2 $ is, $ {C_{(s)}}+{O_{2(g)}}\to C{O_{2(g)}} $

$ \Delta S^{o}=213.5-5.690-205=2.81J{{K}^{-1}} $ .



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