\(n_{Fe_2O_3}=0,01\left(mol\right);n_{H_2SO_4}=\dfrac{5}{49}\left(mol\right)\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+H_2O\)
0,01..............\(\dfrac{5}{49}\)
=> Sau phản ứng H2SO4 dư
\(m_{Fe_2\left(SO_4\right)_3}=0,01.400=4\left(g\right)\)
\(m_{H_2SO_4\left(dư\right)}=\left(\dfrac{5}{49}-0,03\right).98=7,06\left(g\right)\)
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