How does formula mass differ from atomic mass?

1 Answer
anor277
Mar 12, 2017

#"Formula mass"# is the sum of the #"atomic masses"#.........

Explanation:

Take #CO_2#, the atomic mass of carbon is #12.011*g*mol^-1#, that of oxygen is #15.999*g*mol^-1#. Sum the atomic masses, i.e. #(12.011+2xx15.999)*g*mol^-1#, and we get #44.0*g*mol^-1#, which is the formula mass of #"carbon dioxide"#.

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