Question

How do I get the molar mass of urea?

Answer 1

By looking it up.

I get `"60.06 g/mol"`. Of course, you could get the same thing, but you would still have to look up the chemical formula anyways...

`"H"_2"N"-("C"="O")-"NH"_2`

With known atomic masses...

`"H": "1.0079 g/mol"`
`"N": "14.007 g/mol"`
`"C": "12.011 g/mol"`
`"O": "15.999 g/mol"`

we get:

`underbrace(2 xx 1.0079 + 14.007)_("H"_2"N") + underbrace(12.011 + 15.999)_("C"="O") + underbrace(14.007 + 2 xx 1.0079)_("NH"_2)`

`=` `color(blue)("60.056 g/mol")` `~~` `"60.06 g/mol"`