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Consider the following reactions, I. N...

Consider the following reactions,
I. `N_(2) + O_(2) rarr 2NO, " "Delta H = x_1" "II. 2CO + O_(2) rarr2CO_(2), " "Delta H = x_(2)`
III. `2H_2O + O_(2) rarr 2H_(2)O_(2),Delta H = x_(3)" "IV. PCl_(3) + CL_(3) rarr PCl_(3) + Cl_(2) rarr PCl_(5) , " "Delta H = x_(4)`
In which case(s), `Delta H_(f) = (DeltaH)/(2)` ?

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