2006-12-01 09:22:18 · 3 answers · asked by Tim H 1 in Science & Mathematics ➔ Chemistry
Exact Mass: 137.9052
Mol. Wt.: 137.32
2006-12-01 09:28:14 · answer #1 · answered by chemguy 2 · 0⤊ 0⤋
Notice how it is '137. something something'! If you looked at several Periodic Tables you would find all the AMU's would be close but not necessarily the same??
The mass number is an 'average' mass of the common isotopes in about 6.023 x 10 to the 23rd atoms. It is not the mass of 'an' atom of Barium, but a mole of Barium.
The most common isotopes' mass would be the ave. mass rounded.
Get an "A".
2006-12-01 12:56:43 · answer #2 · answered by teachr 5 · 0⤊ 0⤋
It has atomic wt as it is a element.while my friend upards has written Mol. wt.
it is 137.5 but in calculations it is taken as 137.3
i hope this will help you out
2006-12-01 12:40:12 · answer #3 · answered by maulik g 2 · 0⤊ 0⤋