Question

compuesto que tiene mayor peso molecular; fosfato de calcio Ca3(PO4)2 o, sulfato de aluminio Al2(SO4)3

Answer 1

Ca3(PO4)2
Ca: 3 x 40 = 120 g/mol
  P: 2 x 31 = 62 g/mol
  O: 8 x 16 = 128 g/mol
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           Mm = 310 g/mol

Al2(SO4)3

Al: 2 x 27 = 54 g/mol
  S: 3 x 32 = 96 g/mol
  O: 12 x 16 = 192 g/mol
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           Mm = 342 g/mol

segun los calculos el mayor de Mm es el sulfato de alumino