A welder using a tank of volume 7.00×10−2 m3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure

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A welder using a tank of volume 7.00×10−2 m3 fills it withoxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of3.25×105 Pa and temperature of 36.1 ∘C. The tank has a small leak,and in time some of the oxygen leaks out. On a day when thetemperature is 21.7 ∘C, the gauge pressure of the oxygen in thetank is 1.85×105 Pa .A Find the initial mass of oxygen. B Find themass of oxygen that has leaked out.