天氣好好 發問時間: 科學化學 · 10 年前

普通化學的問題(反應方程與熱量計算) 10點

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.

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  • 小白
    Lv 7
    10 年前
    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

     

     

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