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Medical grade Heliox, used in cases of respiratory distress, may contain 20.0 mole % oxygen (O2)...

Medical grade Heliox, used in cases of respiratory distress, may contain 20.0 mole % oxygen (O2) and 80.0 mole % helium (He). A 49.8 L tank is filled to a total pressure of 12.0 atm at 22 o C. What is the mass of helium in the tank? Of oxygen?

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