Yes, there are tables and databases available that provide atomic mass information for molecules and compounds, not just individual elements. These sources often include the average atomic masses of the atoms within the molecule or compound.
One widely used resource is the CRC Handbook of Chemistry and Physics, which provides comprehensive and up-to-date information on various chemical and physical properties, including atomic masses of molecules and compounds.
Another commonly used online database is the NIST Chemistry WebBook, maintained by the National Institute of Standards and Technology (NIST). It offers a wide range of chemical and physical data, including atomic masses of molecules and compounds.
You can access these resources either online or in print for detailed information on the atomic masses of molecules and compounds.