对歧化反应和归中反应方程式 ,根据元素化合价的差值很快可以配平 .例如反应 :3Ｎ+4 Ｏ2 +Ｈ2 Ｏ =2ＨＮ+5Ｏ3+Ｎ+2 Ｏ中 ,+ 4价的Ｎ+4 前的系数 3,即为 + 5价的Ｎ+5和+ 2价Ｎ+2 的化合价之差 :+5 -(+ 2 ) =3;+ 5价的Ｎ+5前的系数 2 ,它是 + 4价的Ｎ+4和 + 2价的Ｎ+2 的化合价 The disproportionation reaction and the equilibrium reaction equation can be quickly balanced according to the difference in elemental valences. For example, the reaction: 3N+4O2+H2O=2HN+5O3+N+2O, +4+N+4 The coefficient 3, which is the difference between the valences of the +5 valence N+5 and the +2 valence N+2: +5 - (+2) =3; +the coefficient before the N + 5 of the 5 valences, which is +4 Valence N+4 and +2 Valence N+2 Valence