A 2l bottle contains a gaseous mixture of helium and oxygen (O₂). the temperature and total pressure of the gaseous mixture in the bottle is 30c and 1atm, respectfully. if the density of the oxygen gas in the mixture is 0.521 g/l, what is the partial pressure of the helium gas in atm? note that the ideal gas constant is 0.08206 (l*atm)/(mol*k).
