Question

Three gases (8.00 of methane, , 18.0 of ethane, , and an unknown amount of propane, ) were added to the same 10.0- container. At 23.0 , the total pressure in the container is 3.50 . Calculate the partial pressure of each gas in the container.

Answer 1

Partial pressure is divided according to mole ratio.

Figure out the moles of each, than add to get total moles.

pressuremethane= molesmethane/totalmoles * total pressure

pressurethane= moleethane/totalmoles * total pressure

and so on. until you get the ones you know.
then pressure propane= total pressure-sum of partial pressures ethane, methane, ...