Helium scuba tank

To minimize the problem, scuba tanks are often filled with mixtures of helium and oxygen rather than nitrogen and oxy-... 

A scuba tank is filled with Trimix, a breathing gas mixture for deep scuba diving. The tank contains oxygen with a partial pressure of 20. atm, nitrogen with a partial pressure of 40. atm, and helium with a partial pressure of 140. atm. What is the total pressure of the breathing mixture, in atmospheres ... 

Scuba divers use a mixture of helium and oxygen in their tanks. What is the pressure of the oxygen in a tank if the pressure caused by the helium is 200 torr and the total pressure in the tank is 925 torr ... 

Mixtures of helium and oxygen can be used in scuba diving tanks to help prevent "the bends." For a particular dive, 46 L Fie at 25°C and 1.0 atm and 12 L O2 at 25°C and 1.0 atm were pumped into a tank with a volume of 5.0 L. Calculate the partial pressure of each gas and the total pressure in the tank at 25°C. 

A Hehox breathing mixture of oxygen and hehum is prepared for a scuba diver who is going to descend 200 ft below the ocean surface. At that depth, the diver breathes a gas mixture that has a total pressure of 7.00 atm. If the partial pressure of the oxygen in the tank at that depth is 1140 mmHg, what is the partial pressure, in atmospheres, of the helium in the breathing mixture ... 

A 12.5 L scuba diving tank contains a helium-oxygen (heliox) mixture made up of 24.2 g of He and 4.32 g of O2 at 298 K. Calculate the mole fraction and partial pressure of each component in the mixture and the total pressure of the mixture. 

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