Question

Ajutor!!
Calculati masa (in g) pentru: a) 2 moli H₂O
b) 12,44·10²⁴molecule HCI​

Answer 1

Răspuns:

Explicație:

n= m : M           [  n= nr. moli      m=masa subst.     M= masa molara ]

m= n . M

a.

m= n . M

M H2O= 2 +16=18-------> 18g/moli

m= 2moli . 18g/moli=36g H2O

b.  12,44 .10 la 24= 124,4 .10²³

n= 124,4 .10²³ : 6,022 .10²³ =20,65 moli HCl

M =1 + 35,5= 36,5-------> 36,5g/moli

m= 20,65moli . 36,5g/moli =753,7 g HCl