Răspuns:
Explicație:
Ra CuSO4=1:2:4
Ra H2SO4=2:1:4
Ra Al2O3=2:3
Ra KNO3=1:1:3
Rm CuSO4=64:32:4*16=64:32:64=2:1:2
Rm H2SO4=2:32:16*4=2:32:64=1:18:32
Rm Al2O3=2*27:3*16 =54:48=27:24
Rm KNO3=39:14:3*16=39:14:48
MCuSO4=64+32+64=160
MH2SO4=2+32+64=98
MAl2O3=54+48=102
MKNO3=39+14+48=101
