Question

A heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium.
What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 9.3 atm?

Answer 1

find moles of each. Then add them to get total moles.

pressureO2= molesO2/totalmoles * 9.3atm
pressureHe=molesH2/totalmoles*9.3 atm

http://en.wikipedia.org/wiki/Dalton%27s_law

Answer 2

12