Bài 7
Fe2O3 + 3H2SO4 → Fe2(SO4)3 + 3H2O
a → a
CuO + H2SO4 → CuSO4 + H2O
b → b
\(\left\{{}\begin{matrix}160a+80b=32\\400a+160b=72\end{matrix}\right.\) ⇔ \(\left\{{}\begin{matrix}a=0,1\\b=0,2\end{matrix}\right.\)
%Fe2O3 = \(\dfrac{0,1.160}{32}.100\%\)=50%
%CuO=50%
Bài 7 ( Bổ sung, không đọc kĩ đề :(( )
b)
nH2SO4 = 3a+b =3.0,1+0,2=0,5 mol
CM H2SO4 = \(\dfrac{0,5}{0,2}\) = 2,5M
c)
CM Fe2(SO4)3 = \(\dfrac{0,1}{0,2}\)= 0,5M
CM CuSO4 = \(\dfrac{0,2}{0,2}\) = 1M