How does atomic mass relate to the unit "mole"?

The mole represents the link between atoms and molecules (of which we can conceive) to the macro world of grams and kilograms and analytical balances. The mass of a pure substance represents a specific number of pure substance 'molecules', as defined by molecular weight.

For elements, the molar mass is the relative atomic mass (atomic weight) found on the periodic table, in g/mol.

For example, the molar masses of the following elements are:
#"H":##"1.00794 g/mol"#
#"C":##"12.0107 g/mol"#
#"O":##"15.999 g/mol"#

Therefore, one mole of hydrogen has a mass of #"1.00794 g"#; one mole of carbon has a mass of #"12.0107 g"#, and one mole of oxygen has a mass of #"15.999 g"#.

To determine the molar mass of compounds, the subscript of each element is multiplied times the molar mass of each element and the results are added.

For example, determine the molar mass of glucose, #"C"_6"H"_12"O"_6"#.

#(6xx12.0107"g/mol")+(12xx1.00794"g/mol")+(6xx15.999"g/mol")=#

#(72.0642"g/mol")+(12.0953"g/mol")+(95.994"g/mol")="180.159 g/mol"#

Therefore, one mole of glucose has a mass of #"180.159 g"#.