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masa atomica 12,01115 (g/mol)
hidrogeno: simbolo H #atomico 1
masa atomica 1,00797 (g/mol)
oxigeno: simbolo O #atomico 8
masa atomica 15,9994 (g/mol)
nitrogeno: simbolo N #atomico 7
masa atomica 14,0067 (g/mol)