Question

3. Determinaţi numărul de moli de substanţă din:
a) 282 g K2O
b) 95 g MgCl2
c) 68 g NH3
d) 90 g H2O

Answer 1

Răspuns:

Explicație:

a.

MK2O= 2.39  + 16=94----> 94g/moli

n= m : M

n= 282g  : 94g/moli= 3 moli K2O

b.

MMgCl2= 24 + 2.35,5= 95 -----> 95g/moli

n= 95 g : 95g/moli= 1mol MgCl2

c.

MNH3= 14 + 3=17-----> 17g/moli

n= 68g : 17g/moli= 4 moli NH3

d.

MH2O=2 + 16=18----> 18g/moli

n= 90g : 18g/moli= 5 moli H2O