Răspuns :

Raportul masic si atomic pt fiecare substanta
H3PO4 - raport atomic = H:P:O = 3:1:4
           - raport masic = H:P:O = 3:31:4*16=3:31:64
Al2(SO4)3 - raport atomic = Al:S:O = 2:3:12
                - raport masic = Al:S:O = 2*27:3*-32:12*16=54:96:192=9:16:32