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}} $



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