Question

Determiná numárul de electroni din:
a) 46 g Na;
b) 2 moli Fa;
c) 20 kg Ne

Answer 1

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