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The enthalpies of formation of \( \mathrm{N}_{2} \mathrm{O} \) and \( \mathrm{NO} \) at 298
P \( \mathrm{K} \) are 82 and \( 90 \mathrm{~kJ} \mathrm{~mol}^{-1} \). The enthalpy of the

W reaction: \( \mathrm{N}_{2} \mathrm{O}(\mathrm{g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NO}(\mathrm{g}) \)
(1) \( -8 \mathrm{~kJ} \)
(2) \( 98 \mathrm{~kJ} \)
(3) \( -74 \mathrm{~kJ} \)
(4) \( 8 \mathrm{~kJ} \)
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