The energies of activation for forward and reverse reactions for \( \mathrm{A}_{2}+\mathrm{B}_{2... VIDEO
The energies of activation for forward and reverse reactions for \( \mathrm{A}_{2}+\mathrm{B}_{2} \rightleftharpoons 2 \mathrm{AB} \) are \( 180 \mathrm{~kJ} \mathrm{~mol}^{-1} \) and \( 200 \mathrm{~kJ} \mathrm{~mol}^{-1} \) respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by \( 100 \mathrm{~kJ} \) \( \mathrm{mol}^{-1} \). The enthalpy change of the reaction \( \left(\mathrm{A}_{2}+\mathrm{B}_{2} \rightarrow\right. \) \( 2 \mathrm{AB} \) ) in the presence of a catalyst will be (in \( \mathrm{kJ} \mathrm{mol}^{-1} \) )
(a) 20
(b) 300
(c) 120
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