For which one of the fllowing reactions 4Hnm qua to the heat

For which one of the fllowing reactions 4Hnm qua to the heat of formation of the produal rxn A) P (g) + 4H (g) + Br (g) PH4Br (1) B) (1 /2)N 2 (g) + O2 (g) NO2 (g) C) N2 (g) + 3H2 (g) 2NH3 (g) D)&C; (s) + 6H (g) C6H6 (1) E) 12C (g) + 11H2 (g) + 110 (g) C6H2201 1 (g)

Solution

Answer option B) 1/2 N2 + O2 ---> NO2

standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.