Verified Solution • 2025–26 Session moderate

QAIPMT-2004-Ph-2614: NEET 2004 Chemistry - Class 11 AIPMT-2004-Ph-2614 Solution: Standard enthalpy and standard entropy changes for the…

Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are −382.64 kJ mol−1-382.64\ \text{kJ mol}^{-1} and −145.6 J K−1 mol−1-145.6\ \text{J K}^{-1}\ \text{mol}^{-1}, respectively. Standard Gibb's energy change for the same reaction at 298 K is

Multiple Choice Options

  • A −221.1 kJ mol−1-221.1\ \text{kJ mol}^{-1}
  • B −339.3 kJ mol−1-339.3\ \text{kJ mol}^{-1}
  • C −439.3 kJ mol−1-439.3\ \text{kJ mol}^{-1}
  • D −523.2 kJ mol−1-523.2\ \text{kJ mol}^{-1}

Step-by-Step Verified Solution

_ G = _ H � T _ S _ G = �382.64 _ 103 J mol �1 � (298K) (�145.6 JK �1 mol �1 ) = �382640 + 43388.8 = � 339251.2 J mol �1 = � 339.3 kJ mol �1

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