P1:
nNaOH = 0.1 * 2 = 0.2 (mol)
2NaOH + Al2O3 => 2NaAlO2 + H2O
0.2..............0.1
P2:
nH2O = 10.8/18 = 0.6(mol)
Fe2O3 + 3H2 -t0-> 2Fe + 3H2O
0.2.....................................0.6
\(\%Fe_2O_3=\dfrac{2\cdot\left(0.2\cdot160\right)}{2\cdot\left(0.1\cdot102\right)+2\cdot\left(0.2\cdot160\right)}\cdot100\%=75.83\%\)
\(\%Al_2O_3=100-75.83=24.17\%\)