Chemical Thermodynamics Question 157
Question: Standard enthalpy and standard entropy changes for the oxidation of ammonia at $ 298,K $ are $ -382.64,kJ,mo{{l}^{-1}} $ and $ -145.6,J{{K}^{-1}}mo{{l}^{-1}} $ , respectively. Standard Gibbs energy change for the same reaction at $ 298,K $ is [CBSE PMT 2004]
Options:
A) - 439.3 kJ $ mo{{l}^{-1}} $
B) - 523.2 $ kJ,mo{{l}^{-1}} $
C) - 221.1 $ kJ,mo{{l}^{-1}} $
D) - 339.3 $ kJ,mo{{l}^{-1}} $
Show Answer
Answer:
Correct Answer: D
Solution:
$ \Delta G=\Delta H-T\Delta S $
$ \Delta G=-382.64-(-145.6)\times {{10}^{-3}}\times 298 $
$ =-339.3,KJ,mo{{l}^{-1}} $
