普通化學的問題(反應方程與熱量計算) 10點

Question

Consider the reaction below for the conversion nitrogen dioxide to nitric oxide and O2. 2NO2(g) → 2NO(g) + O2(g) ΔHf° (kJ/mol)NO2(g) +33.18 NO(g) +90.25 Calculate ΔHo (per mol of O2 formed) for the reaction at 298 K.

請問這個題目要怎麼寫?

Answer 1

最佳解答

(1/2)N2(g) + (1/2)O2(g) → NO(g) , ΔH = +33.18 kJ ................ (1)

　

(1/2)N2(g) + O2(g) → NO2(g) , ΔH = +90.25 kJ .................... (2)

　

(2)式反應物與生成物對調，

　

NO2(g) → (1/2)N2(g) + O2(g) , ΔH = -90.25 kJ .................... (3)

　

(1)+(3) , NO2(g) → NO(g) + (1/2)O2(g) , ΔH = -57.07 kJ

　

==> 2NO2(g) → 2NO(g) + O2(g) , ΔH = -114.14 kJ

　

==> ΔHf° = -114.14 kJ/mol