Question

Cati molli se afla in
a)4 g Ca
b)4,8 g Mg
c)14,2 g Cl
d)1,2044*10 la puterea 24 Na

Answer 1

Răspuns:

Explicație:

n = m : M

a.

n=4g : 40g/moli=0, 1moli Ca

b.

n=4,8g : 24g/moli=0,2moli Mg

c.

n=14,2g : 71g/moli=0,2moli Cl2

d.

1,2044.10la 24=12,044 .10²³

n= 12,044 .10²³ : 6,023 .10²³------>2moliNa