- #1
CJIME017
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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 21.3 Celsius, the gauge pressure of the oxygen in the tank is 1.90×10^5 Pa.
1) Inital Mass of the Oxygen.
2) Find the mass of the oxygen that has leaked out.
Homework Equations
pV = nRT
n = [tex]pv/RT[/tex]
m = Mn; M = Molar Mass
The Attempt at a Solution
1)
n = [tex]pv/RT[/tex]
n = [tex](2.80*10^5)(.08)/(8.314)(312)[/tex] = 8.635 mol
m = Mn
m = (32 g/mol)(8.635 mol) = 276g = .276 kg
I got this answer and it was incorrect, I don't know where I went wrong...
2) I need the answer to 1) before I can attempt this.