con bai nay nua lam giup t luon

C

cothukymovit

bai nay nua: dot chay 6,72 g fe trong kk dc hhX fe0 fe304 fe203 fe du De hoa tan X can dung 0,45 mol HNO3 thu dc V l Khi NO2 Gia tri V,m ?
 
C

cobe_tinhnghich_lemlinh

Fe---> Fe3+ + 3e // 2O2- + 4e -----> O2
m/56..............3m/56 // (12-m)/32.........(12-m)/8
N+5 + 3e -----> N+3
..........0,3..........0,1
ta có pt: 3m/56 = (12-m)/8+0,3 => m=10,08g
 
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