HELP! Chemistry Question!!! (1 Viewer)

[Oobadoo]

I am doing an assignment on copper and aluminium, its really quite easy. However, I need to know what the crustal percentage of copper is, or the crustal abundance if you like. Most sources say 60 parts per million roughly, which is 0.00006 % (NASA says 0.00007). BUT virtually every othersource is simultaneously saying that the percentage of copper by weight is 0.0058 %!!!!! Does anyone know which one to go with???

(If the answer is terribly obvious I must have had a mental colapse and I apologise)

 

[nat_doc]

go with Nasa. it really doesn't matter... as long as you acknowledge it in ur biblio, then ur correct