Question

What is the mass of `"sodium bicarbonate"`, `NaHCO_3`, in `"amu"`?

Answer 1

For `NaHCO_3`, well take...........................
`{1xx23+1xx1+1xx12+3xx16}*"u"=??`

Explanation:

And I make this `84*u..............`

From where did I get the individual atomic masses?