Question

what is the atomic mass of BaCl2?

Answer 1

Atomic mass and molar mass are essentially the same thing. The atomic mass is the average mass of the element based on which isotope shows up more in nature. Molar Mass is the grams it takes of any element to equal one mole ( or the mass that 6.022 x 10²³ atoms of that element.) They can be interchanged, because they are basically the same thing.

When you think about it, if each atom ways however much, then 6.022 x 10²³ atoms would have the same proportional weight as a single atom. The chances are, you are going to use Molar Mass a lot more, so just accept that its the same thing.

BaCl₂ = 137.33 u + 2(35.45 u)

= 137.33 u + 70.90 u

= 208.23 u