3Fe+2O2-to->Fe3O4
0,035------0,0175 mol
n Fe=\(\dfrac{5,6}{56}\)=0,1 mol
n O2=\(\dfrac{1,12}{32}\)=0,035 mol
=>Fe dư
=>m Fe3O4=0,0175.232=4,06g
=>m Fedư=\(\dfrac{19}{1200}.56\)=0,886g
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