Question

determina masa a 2 mol de substanta ZnCl2
a) 300g b) 272g c) 278g d)27,2g
URGEEENT!!

Answer 1

ZnCl2=136g/mol

2 moli=272

Answer 2

Răspuns:

b.

Explicație:

n = m : M      ;  n=nr. moli   ; m =masa subst.   ; M=masa molara

m= n . M

MZnCl2=65 + 2 . 35,5=136------> 136g/moli

m=2moli . 136g/moli= 272 g ZnCl2