Ah yes, I'm sorry I didn't update the question, I figured it out already. And also, it was 8.0 x 10^-2 not -3, that was a mistake. Thank you for your time, I do appreciate it.
Homework Statement
A welder using a tank of volume 8.00X10^-3 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol) at a gauge pressure of 2.80×10^5 Pa and temperature of 39.0 Celsius. The tank has a small leak, and in time some of the oxygen leaks out. On a day when the temperature is...