Răspuns:
a)
MNa=23g/mol
n=m/M=46/23=2moli
11x6,022x10²³= 66,242×10²³
1molNa.........11xNAe
2 moliNa........xe
x=2×66,242×10²³/1=calculează
b)
1molFe......26x6,022×10²³e
2molFe........ye
y=2×26x6,022×10²³e/1=calculează
c)
MNe=10kg/kmol
n=m/M=20/10=2kmol
2kmoli=2000moli
1molNe..................10x6,022×10²³e
2000moliNe..........ze
z=2000×.10x6,022×10²³e/1=calculează