Đổi 5,4tấn=5400000g5,4tấn=5400000g
nAl=5400000/27=200000gnAl=5400000/27=200000g
pthh:pthh:
4Al+3O2→2Al2O34Al+3O2→2Al2O3
theo pt :
nAl2O3=1/2/nAl.75%=1/2.200000.75%=75000molnAl2O3=1/2/nAl.75%=1/2.200000.75%=75000mol
⇒mAl2O3=75000.102=7650000g⇒mAl2O3=75000.102=7650000g
⇒mquặng=7650000÷80%=9562500g=9,5625tấn