Fe2O3+_______NaNO3+____NaOH==____Na2FeO4+____NaNO2+____H2O

___a__Fe2O3+___b____NaNO3+__c__NaOH
-->_d___Na2FeO4+_e___NaNO2+_f___H2O
左边:Fe:2a
Na:b+c
O:3a+3b+c
N:b
H:c
右边:
Fe:d
Na:2d+e
O:4d+2e+f
N:e
H:2f
列方程:
2a=d
b+c=2d+e
3a+3b+c=4d+2e+f
b=e
c=2f
和和~~~
a=1 b=3 c=4 d=2 e=3 f=2
最原始的方法,如果实在配不出,用这个方法很实用哦.

3 4 2 3 2

Fe2O3+___3___NaNO3+_4___NaOH==__2__Na2FeO4+__3__NaNO2+__2__H2O

__1__Fe2O3+___3___NaNO3+__4_NaOH==___2_Na2FeO4+__3__NaNO2+__2__H2O