Gọi m ZnO=a ----> m Al2O3=a (g)
==> n ZnO=\(\frac{a}{81}\); n Al2O3=\(\frac{a}{102}\)(mol)
ZnO + 2HCl ----> ZnCl2 + H2
\(\frac{a}{81}\) ------> \(\frac{a}{81}\) (mol)
m ZnCl2 = \(\frac{a}{81}\). 136=\(\frac{136a}{81}\)(g)
Al2O3 + 6HCl ----> 2AlCl3 + 3H2O
\(\frac{a}{102}\)-------> \(\frac{a}{51}\) (mol)
m AlCl3 = \(\frac{a}{51}\). 133,5=\(\frac{89a}{34}\)(g)
==> \(\frac{mZnO}{mAl2O3}\)=\(\frac{136a}{81}\): \(\frac{89a}{34}\)=\(\frac{4624}{7209}\)