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For a reaction, \( \mathrm{N}_{2}+3 \mathrm{H}_{2} \longrightarrow 2 \mathrm{NH}_{3} ; \Delta H=-22 \mathrm{kcal} \). If energy of activation for this reaction is \( 70 \mathrm{kcal} \), the energy of activation for backward reaction is:
(A) \( 70 \mathrm{kcal} \)
(B) \( 92 \mathrm{kcal} \)
(C) \( 48 \mathrm{kcal} \)
(D) none of these
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