20. Consider the reaction below for the conversion nitrogen dioxide to nitric oxide and O2. Calculate the △H° (per mole of O2 formed) for the reaction at 298 K.

 [Hint:2NO2(g) → 2NO(g) +O2(g)；△H0formation  (NO2(g))= 33k.J I mol；△H0formation (NO(g)) = 90k.J /mo/]
(A)114.1 J,
(B) 1.141 kJ,
(C) 11.41 kJ,
(D) 114.1 kJ,
(E) 1,141 kJ

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