Enthalpy change for the reaction P \( 2 \mathrm{~N}(\mathrm{~g})+6 ...

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Enthalpy change for the reaction
P \( 2 \mathrm{~N}(\mathrm{~g})+6 \mathrm{H}(\mathrm{g}) \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g}) \) is \( -900 \mathrm{~kJ} \)

W The dissociation energy of \( \mathrm{N}-\mathrm{H} \) bond is
(1) \( +450 \mathrm{~kJ} \)
(2) \( -450 \mathrm{~kJ} \)
(3) \( +150 \mathrm{~kJ} \)
(4) \( -150 \mathrm{~kJ} \)
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