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 8.6 atm ?
We’re being asked to calculate the partial pressure of oxygen (O) in a mixture of oxygen (O) and helium (He).
Recall that the partial pressure of a gas (PGas) in a mixture is given by:
where χGas = mole fraction of the gas and Ptotal = total pressure of the gas mixture.
The mole fraction of the gas is then given by:
We will do the following steps to solve the problem:
Step 1: Calculate the moles of O and He
Step 2: Calculate the mole fraction of O
Step 3: Calculate the partial pressure of O