Question

Heliox is a helium‑oxygen mixture that may be used in scuba tanks for divers working at great depths. It is also used medically as a breathing treatment. A 6.25 L tank holds helium gas at a pressure of 1.300×103 psi. A second 6.25 L tank holds oxygen at a pressure of 345.5 psi. The two gases are mixed in a 6.25 L tank. If the temperature remains the same throughout the process, what is the pressure of the gas mixture in the tank? Assume ideal gas behavior.

Answer 1

The tank 1 has helium gas at, and volume

So the number of moles of helium is given by the equation,

The tank 2 has oxygeb gas at, and volume

Now this gas is filled into another tank of volume, and the total number of moles of gases inside that cylinder is,

Now the pressure can be calculated as,

So the total pressure of the gas mixture in the tank is 1645.5 psi