cual es el que presenta el mayor porcentaje de sodio en los compuestos ?
a) Oxido de sodio.
b) Hidroxido de sodio
c) Cloruro de sodio
d) Hipoclorito de sodio
e) cloruro de hidrogeno
Respuestas
cual es el que presenta el mayor porcentaje de sodio en los compuestos ?
a) Oxido de sodio (Na2O)
Na: 2 x 23 = 46 g/mol
O: 1 x 16 = 16 g/mol
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Mm = 62 g/mol
% de sodio (Na)
62 g ------ 100 %
46 g ------- x
x = 74.19 %
b) Hidroxido de sodio: NaOH
Na: 1 x 23 = 23 g/mol
O: 1 x 16 = 16 g/mol
H: 1 x 1 = 1 g/mol
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Mm = 40 g/mol
% de sodio (Na)
40 g ---- 100 %
23 g ---- x
x = 57.5 %
c) Cloruro de sodio: NaCl
Na: 1 x 23 = 23 g/mol
Cl: 1 x 35.5 = 35.5 g/mol
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Mm = 58.5 g/mol
% de sodio (Na)
58.5 g ---- 100 %
23 g ---- x
x = 39.32 %
d) Hipoclorito de sodio: NaClO
Na: 1 x 23 = 23 g/mol
Cl: 1 x 35.5 = 35.5 g/mol
O: 1 x 16 = 16 g/mol
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Mm = 74.5 g/mol
% de sodio (Na)
74.5 g ---- 100 %
23 g ---- x
x = 30.87 %
e) cloruro de hidrógeno: HCl
H: 1 x 1 = 1 g/mol
Cl: 1 x 35.5 = 35.5 g/mol
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Mm = 36.5 g/mol
% H
36.5 g ---- 100 %
1 g ---- x
x = 2.74 % H
% Cl
36.5 g ---- 100 %
35.5 g ---- x
x = 97.26 % Cl
el compuesto con mayor % es el óxido de sodio (a)