The tank shown below contains helium , nitrogen , and oxygen gas and it has a volume of 425 L. Each marker in the container represents a mole of gas in the mixture . The container is at room temperature 25 C .

Part a. Count the number of moles of helium in the sample . Repeat for nitrogen and oxygen .
Part b. Determine the mole fraction of each of the three gases.
Part c. Calculate the pressure of each gas. Use the volume and temperature listed above for each calculation.
Part d. Find the total pressure inside the container by adding the partial pressure for each gas.