A mixture contains two gases, Argon and oxygen. There are 9.08 moles total and argon makes up 1.04 of those moles. If the total pressure exerted by the gas mixture is 873 torr, what is the partial pressure of oxygen gas in torr

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3