Question

The molar mass of barium nitrate (`Ba(NO_3)_2`) is 261.35 g/mol. What is the mass of `5.30 x 10^22` formula units of `Ba(NO_3)_2`?

Answer 1

Well, how many barium nitrate formula units are in `261.35*g`?

Explanation:

It is fact that `6.023xx10^23` formula units of barium nitrate have a mass of `261.35*g`. This is what we specify when we say molar mass. And thus the mass of `5.30xx10^22` formula units of barium nitrate is the quotient multiplied by the molar mass:

`(5.30xx10^22)/(6.023xx10^23)molxx261.35*g*mol^-1` `=??g`