3NaOH+AlCl3=Al(OH)3+3NaCl
NaOH+Al(OH)3=NaAlO2+2H2O
mр(AlCl3)=10000*1.04=10400г
m(AlCl3)=10400*0.05=520г
n(AlCl3)=n(Al(OH)3==n2(NaOH)=520/133.5=3.895моль
n1(NaOH)=3.895*3=11.685моль
nобщее(NaOH)=11.685+3.895=15.58моль
m(NaOH)=15.58*40=623.2г
mр(NaOH)=623.2/0.06=10387г