Question

Calculati nr de moli din: 640 g de Cupru
840 g NaSO4
780 g AgNO3
1450 g MgO

Answer 1

Răspuns:

Explicație:

Se foloseste relatia :

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

n=640 g  : 64g/moli=10 moli Cu

MNa2SO4=2.23 + 32 + 4.16=142--------> 142g/moli

n=840g : 142 g/moli=5,9 moli Na2SO4

MAgNO3=108 +14 +3.16=170--------> 170g/moli

n=780g : 170g/moli=4,58 moli AgNO3

M MgO=24 +16=40--------> 40g/moli

n=1450g : 40 g/moli=36,25 moli MgO