mFe2O3 =\(\dfrac{75.16}{100}=12g\)
nFe2O3=12/160=0,075mol
mCuO=16-12=4g
nCuO=4/80=0,05mol
pt : Fe2O3 + 3H2 -----> 2Fe + 3H2O
npứ:0,075--->0,225(1)
mFe=0,15.8,4g
pt : CuO + H2 ------> Cu + H2O
npứ:0,05-->0,05(2)
mCu = 0,05.64=3,3g
từ pt (1),(2) ta có nH2 =0,05 + 0,225=0,275mol
VH2 =0,275.22,4=6,16l