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}} $ .
