Question

calcular el peso porcentual acido fosforico y del hidroxido de calcio

Answer 1

acido fosforico: H3PO4

H: 3 x 1 = 3 g/mol
P:1 x 31 = 31 g/mol
O: 4 x 16 =64 g/mol
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        Mm =98 g/mol

H:
 98  g ---------  100%
  3 g  ---------      x
x = 3.06 % H

P:
 98  g ---------  100%
 31 g  ---------      x
x = 31.63 % P

O:
 98  g ---------  100%
  64 g  ---------      x
x = 65.30 % O

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Ca(OH)2

Ca:  1 x 40 = 40 g/mol
O:  2 x 16 = 32 g/mol
H: 2 x 1 = 2 g/mol
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     Mm =74 g /mol

Ca:
74 g -----  100%
40 g -----      x
x = 54.05 % de Ca

O:
74 g -----  100%
32 g -----      x
x = 43.24 % de O

H:
74 g -----  100%
  2 g -----      x
x = 2.70 % de H