Răspuns:
Ca(NO3)2
r.atomic Ca:N:O=1:2:6
r.masa=Ca:N:O=40:28:96=10:7:24
compozitie procentuala
MCa(NO3)2=40+2×14+6×16=164g/mol
164gCa(NO3)2.................40gCa...............28gN............96gO
100gCa(NO3)2.....................xgCa...............ygN................zgO
x=100×40/164=calculeaza
y=100×28/164=calculeaza
z=100×96/164=calculeaza
Al2(SO4)3
r.atomic=Al;S:O=2:3:12
r.masa =Al;S:O=54:96:192=3:8:16
compozitie procentuala
MAl2(SO4)3=2×27+3×32+12×16=342g/mol
342gAl2(SO4)3..................54gAl.......96gS...............192gO
100gAl2(SO4)3.....................agAl.............bgS................cgO
a=100×54/342=calculeaza
b=100×96/342=calculeaza
c=100×192/342=calculeaza
Explicație:
