<p>A gaseous mixture containing 7.0 moles of nitrogen, 2.5 moles of oxygen, and 0.50 mole of
helium exerts a total pressure of 0.90 atmosphere. What is the partial pressure of the nitrogen?
The place from which I got this question says that the answer is 6.3 atm, while I got .63 atm which seems like the right answer, and I cannot fathom how the answer could be 6.3.
It's .63, right?</p>
<p>I'd post it in the AP forums, but I don't want to wait 4 days to get a response to this really quick question</p>