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Question: Answered & Verified by Expert
Energy of activation of forward reaction for an endothermic process is $50 \mathrm{~kJ}$. If enthalpy change for forward reaction is $20 \mathrm{~kJ}$ then enthalpy change for backward reaction will be
ChemistryThermodynamics (C)AIIMSAIIMS 2013
Options:
  • A $30 \mathrm{~kJ}$
  • B $20 \mathrm{~kJ}$
  • C $70 \mathrm{~kJ}$
  • D $50 \mathrm{~kJ}$
Solution:
2683 Upvotes Verified Answer
The correct answer is: $30 \mathrm{~kJ}$


For endothermic reaction,
$E_{a, b}=E_{a, f}-\Delta H^{\circ}$
$=50 \mathrm{~kJ}-20 \mathrm{~kJ}=30 \mathrm{~kJ}$

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