Chemistry Practice Problems Partial Pressure Practice Problems Solution: A heliox deep-sea diving mixture contains 2.0 g of...

Solution: 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 ?

Problem

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 ?

Solution

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:


Pgas = χgasPtotal


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: 


χgas = moles gastotal moles


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


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