Chemical Thermodynamics Question 53
Question: The standard entropies of $ CO_2(g),,C(s) $ and $ O_2(g) $ are 213.5, 5.740 and 205 $ J{{K}^{-1}} $ respectively. The standard entropy of formation of $ CO_2 $ is [Pb. CET 2001]
Options:
A) $ 2.76,J{{K}^{-1}} $
B) $ 2.12,J{{K}^{-1}} $
C) $ 1.12,J{{K}^{-1}} $
D) $ 1.40,J{{K}^{-1}} $
Show Answer
Answer:
Correct Answer: A
Solution:
Standard entropy of formation of $ CO_2(g) $ = standard entropy of $ CO_2(g)- $ [Standard entropy of $ C(s)- $ standard entropy of $ O_2(g) $ ] $ =213.5,-[5.740+205] $
$ =2.76,J/K $ .
