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  • (act | ant) 23:34 11 ago 2025ValDresdner9789 (Discusión | contribuciones). . (11 060 bytes) (+11 060). . (Página creada con «<br>The formula mass of urea (NH₂CONH₂) is calculated by adding the atomic masses of its constituent elements: nitrogen (N), hydrogen (H), carbon (C), and oxygen (O<br>...»)