Fe2O3 +3H2SO4----.Fe2(SO4)3 +3H2O
a) Ta có
n\(_{Fe2O3}=\frac{4}{160}=0,025\left(mol\right)\)
Theo pthh
n\(_{H2SO4}=3n_{Fe}=0,075\left(mol\right)\)
m\(_{H2SO4}=0,075.98=7,35\left(g\right)\)
b)m\(_{ddH2SO4}=\frac{7,35.100}{9,8}=75\left(g\right)\)
c) Theo pthh
n\(_{Fe2\left(SO4\right)3}=n_{Fe}=0,025\left(mol\right)\)
m\(_{Fe2\left(SO4\right)3}=0,025.400=10\left(g\right)\)
C%=\(\frac{10}{75+4}=12,66\%\)
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