Part A: Three gases (8.00 g of methane, CH_4, 18.0g of ethane, C_2H_6, and an unknown amount of propane, C_3H_8) were added to the same 10.0- L container. At 23.0 degrees C, the total pressure in the container is 5.40 atm. Calculate the partial pressure of each gas in the container.
Part B: A gaseous mixture of O_2 and N_2 contains 37.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 405 mmHg?