Question

Calcula la composición centesimal del cloruro de bario y nitrato de potasio

Answer 1

cloruro de bario
BaCl2
calcular masa molecular
Ba: 1 x 137.33 = 137.33 g/mol
Cl: 2 x 35.45 = 70.9 g/mol
``````````````````````````````````````````
           Mm = 208.23
2. Calcular %

Bario

208.23 g ------- 100 %
137.33 g -------      x
x = 65.95 % Ba

Cloro

208.23 g ----- 100 %
     70.9 g -----      x
x = 34.05 % Cl

````````````````````````````````````````
nitrato de potasio
KNO3

K:  1 x 39.09 = 39.09 g/mol
N:  1 x 14 = 14 g/mol
O = 3 x 16 = 48 g/mol
````````````````````````````````````
     Mm = 101.09 g/mol

calcular %

K
101.09 g ------ 100 %
  39.09 g ------      x
       x = 38.67 % K

Nitrógeno

101.09 g ---- 100 %
        14 g ----    x

         x = 13.85 % N

Oxigeno

101.09 g -----  100 %
        48 g -----      x

         x = 47.48 % O