find the mass in atomic mass units of the following,
1 o atom, with a mass of 2.66 X 10^-23 g?
and Br atom with a mass of 1.31 X 10^-22 g?

Question

anonymous · Answer

If I'm reading this right the amu is the exact same number for the individual atoms weight, just in amu. Consider that O has an amu of approximately 15.9994. This represents 6.022*10^{23} atoms. If we divide 15.9994 by that number we end up with 2.66*10^{-23}.
It's possible I'm misreading the question though.

anonymous · Answer

how did you get 6.022 times 10^23 power?

anonymous · Answer

1 o atom equals 15.994 amu, but what do i do next?

anonymous · Answer

I get it, now! Thanx!

anonymous · Answer

I'm sure you found it, but 6.022*10^{23} is Avogadro's number.