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1. calcular Mm del compuesto (Ca3(PO4)2)
Ca: 3 x 40 = 120 g/mol
P: 2 x 30.97 = 61.94 g/mol
O: 8 x 16 = 128 g/mol
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Mm = 309.94 g/mol
2. calcular % de fósforo
309.94 g ----- 100 %
61.94 g ------ x
x = 19.98 % de P
Ca: 3 x 40 = 120 g/mol
P: 2 x 30.97 = 61.94 g/mol
O: 8 x 16 = 128 g/mol
````````````````````````````````
Mm = 309.94 g/mol
2. calcular % de fósforo
309.94 g ----- 100 %
61.94 g ------ x
x = 19.98 % de P
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