# Math Help - Help with Energy problem

1. ## Help with Energy problem

2. It's because the atomic mass is not expressed in kilograms. You have to translate it... Think about it : Can an atom have a mass of 39 kilograms!!!!!?

3. Originally Posted by arbolis
It's because the atomic mass is not expressed in kilograms. You have to translate it... Think about it : Can an atom have a mass of 39 kilograms!!!!!?
I just typed the problem in wrong. See corrected

6.022 x 10^23 ???

4. You still have the same problem with the mass. An atom is much, much less heavy than $0.04 kg$.
Take a look at Atomic mass - Wikipedia, the free encyclopedia, especially at the
"Conversion factor between atomic mass units and grams"

paragraph.
EDIT :
6.022 x 10^23 ???
Yes, you have to use the Avogadro's number.