nNaOH=0,25.2=0,5(mol)
nAlCl3=0,1.1,5=0,15(mol)
PTHH : 3NaOH+AlCl3\(\rightarrow\)3NaCl+Al(OH)3
TPU_____0,5 ___ 0,15
PU ___0,45____ 0,15 ___________0,15
SPU___0,05_____ 0 __________ 0,15
PTHH: NaOH+Al(OH)3\(\rightarrow\)NaAlO2+2H2O
TPU___ 0,05___0,15
PU____0,05____0,05
SPU____0_____0,1
2Al(OH)3\(\rightarrow\)Al2O3+3H2O
0,1________0,05
mAl2O3=0,05.102=5,1(g)