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Standard entropy of \( \mathrm{N}_{2}, \mathrm{H}_{2} \) and \( \mathrm{NH}_{3} \) are 60,40 and
P \( 50 \mathrm{JK}^{-1} \mathrm{~mol}^{-1} \) respectively. For the reaction \( 1 / 2 \mathrm{~N}_{2}+ \)

W \( 3 / 2 \mathrm{H}_{2} \rightleftharpoons \mathrm{NH}_{3}, \Delta \mathrm{H}=-30 \mathrm{~kJ} \) to be at equilibrium, the temperature should be:
(1) \( 500 \mathrm{~K} \)
(2) \( 750 \mathrm{~K} \)
(3) \( 1000 \mathrm{~K} \)
(4) \( 1250 \mathrm{~K} \)
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