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\( \mathrm{N}_{2}(\mathrm{~g})+2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NO}_{2}(\mathrm{~g})+\mathrm{xkJ} \)
P
\( 2 \mathrm{NO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NO}_{2}(\mathrm{~g})+\mathrm{ykJ} \)
W The enthalpy of formation of \( \mathrm{NO} \) is
(1) \( x-2 y \)
(2) \( x-y \)
(3) \( \frac{1}{2}(y-x) \)
(4) \( \frac{1}{2}(x-y) \)
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