Problem: A sample of 1.43 g of helium and an unweighed quantity of O2 are mixed in a flask at room temperature. The partial pressure of helium in the flask is 43.0 torr , and the partial pressure of oxygen is 158 torr .What is the mass of the oxygen in the container?

FREE Expert Solution

We're being asked the mass of oxygen in the container filled with a mixture of oxygen and helium.


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


100% (148 ratings)
View Complete Written Solution
Problem Details

A sample of 1.43 g of helium and an unweighed quantity of O2 are mixed in a flask at room temperature. The partial pressure of helium in the flask is 43.0 torr , and the partial pressure of oxygen is 158 torr .

What is the mass of the oxygen in the container?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Partial Pressure concept. You can view video lessons to learn Partial Pressure. Or if you need more Partial Pressure practice, you can also practice Partial Pressure practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Stroeva's class at GSU.