Question

cual es la composición centesimal de NH4NO3 ,CaCo3 y H2O

Answer 1

   Mm NH4NO3

N: 2 x 14 = 28 g/mol
H: 4 x 1 = 4 g/mol
O: 3  x 16 = 48 g/mol
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         Mm = 80 g/mol

NITROGENO:
  80 g ------  100 %
  28 g ------    x

x = 35 % N

HIDROGENO:
  80 g ------  100 %
    4 g ------    x

x = 5 % H

OXIGENO:

  80 g ------  100 %
  48 g ------    x

x = 60 % O

B) CaCO3

Mm CaCO3

Ca: 1 x 40 = 40 g/mol
  C: 1 x 12 = 12 g/mol
  O: 3 x 16 = 48 g/mol
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         Mm = 100 g/mol

Calcio
100 g ----- 100 %
  40 g -----    x

x = 40 % Ca
 
Carbono
100 g ----- 100 %
  12  g -----    x

x = 12 % C

OXIGENO

100 g ----- 100 %
 48  g -----    x

x =48 % O

C)

Mm H2O

H: 2 x 1 = 2 g/mol
O:  x 16 = 16 g/mol
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     Mm = 18 g /mol

HIDROGENO

18 g ----- 100 %
  2 g -----      x

x = 11.11 % H

OXIGENO

18 g ---- 100 %
 16 g ----  x

x = 88.88 % O