nFe=16.8/56=0.3(mol)
nO2=5.6/22.4=0.25(mol)
a) PTHH: 3Fe + 2O2 ---> Fe3O4
Ban đầu: 0.3 0.25 (mol)
Phản ứng: 0.3 0.2 0.1 (mol)
Sau pứ: 0 0.15 0.1 (mol)
b) mFe3O4= 0.1*232=23.2(g)
c) 2KMnO4 ---> K2MnO4 + MnO2 + O2
2 1 (mol)
0.3 0.15 (mol)
mKMnO4 = 0.3*158=47.4(g)
Mong mn tích cho mik nha