a)27g Al........1mol
54g Al........a
a=54/27=2moli Al
b)1 mol Zn......65g
10 moli......b
b=650g
c)24g Mg......1mol
1200g Mg......c moli
c=1200/24=50 moli
c'=0.05 kmoli
d)32 g S........6.022×10^23 atomi S
16 g S.....,d
d=16×6.022×10^23/32=6.022×10^23/2=3.011×10^23 atomi S;
27,24,32,65 sunt masele atomice ale elementelor respective;