Question

determinar el peso molecular y la composicion centesimal para los siguientes compuestos

CuSo4
KMnO4
CO2

Answer 1

CuSO4

1. Calcular Mm
Cu:  1 x 63.54 = 63.54 g/mol
S: 1 x 32.06 = 32.06 g/mol
O: 4 x 16 = 64 g/mol
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           Mm = 159.60 g/mol

calcular  % del compuesto

Cobre
159.60 g ---- 100 %
  63.54 g  ---   x
x = 39.81 % de cobre (Cu)

AZUFRE
159.60 g ----- 100 %
  32.06 g -----     x
x = 20.08 % de azufre (S)

OXIGENO
159.60 g ----- 100 %
       64 g -----     x
x = 40.10 % de Oxigeno (O)

KMnO4

Calcular la Mm

K: 1 x 39.09 = 39.09 g/ mol
Mn: 1 x 54.93 = 54.93 g/mol
O:  4 x 16 = 64 g/mol
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           Mm = 158.02 g/mol

calcular %

K:
158.02 g ---- 100 %
  39.09 g ----     x
x = 24.74 % K

Manganeso
158.02 g ---- 100 %
  54.93 g ----     x
x = 34.76 % Mn

Oxigeno

158.02 g ---- 100 %
       64 g ----     x
x = 40.50 % O

CO2

Mm

C: 1 x 12 = 12 g/mol
O: 2 x 16 = 32 g/mol
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          Mm = 44 g/mol

Calcular %

carbono

44 g ----- 100 %
12 g -----      x
x = 27.27 % de C

Oxigeno

44 g ----- 100 %
32 g -----     x
x = 72.73 % de O