Question

cate grame reprezinta:
a)3 moli de Na (A=23)
b)3 x Na atomi de C (=12)​

Answer 1

Răspuns:

Explicație:

a.

m= n . M

m= 3moli . 23g/moli= 69g Na

b.

3. 6,022 .10 ²³atomi C= 18 ,066 .10²³ atomi C

1mol de atomi de C ------------6,022.10²³atomi C

xmoli-------------------------------18,066 .10²³

x= 18,066 .10²³ : 6,022.10²³= 3 moli de atomi C

m= n . M

m= 3moli . 12g/moli = 36g C