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Introductory Physics Homework Help
Find the Oxygen Mass in a Welding Tank
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[QUOTE="dereklin, post: 4918836, member: 532049"] [h2]Homework Statement [/h2] A welder using a tank of volume 7.40×10−2m3 fills it with oxygen (with a molar mass of 32.0g/mol ) at a gauge pressure of 3.20×105Pa and temperature of 38.7∘C. The tank has a small leak, and in time some of the oxygen leaks out. On a day when the temperature is 22.9∘C, the gauge pressure of the oxygen in the tank is 1.60×105Pa . [h2]Homework Equations[/h2] (a)Find the initial mass of oxygen. (b)Find the mass of oxygen that has leaked out. [h2]The Attempt at a Solution[/h2] (a)PV=nRT n=PV/RT m=n*32 [URL='http://www.wolframalpha.com/input/?i=%283.2*10%5E5*7.4*10%5E-2%29%2F%288.3144621*%28273.15%2B38.7%29%29*32%2F1000']link to calculations[/URL] answer I got: 0.29225 kg this answer was incorrect [/QUOTE]
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Find the Oxygen Mass in a Welding Tank
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