2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Thermodynamics / रासायनिक उष्मागतिकी

JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Free energy and work function

  • question_answer
    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]

    A)                 ? 439.3 kJ \[mo{{l}^{-1}}\]           

    B)                 ? 523.2 \[kJ\,mo{{l}^{-1}}\]

    C)                 ? 221.1 \[kJ\,mo{{l}^{-1}}\]         

    D)                 ? 339.3 \[kJ\,mo{{l}^{-1}}\]

    Correct Answer: D

    Solution :

               \[\Delta G=\Delta H-T\Delta S\]                    \[\Delta G=-382.64-(-145.6)\times {{10}^{-3}}\times 298\]                                 \[=-339.3\,KJ\,mo{{l}^{-1}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner