## Question

###### A welder using a tank of volume7.90Ã—10âˆ’2 m3m3 fills it with oxygen (with amolar mass of 32.0 g/molg/mol ) at a gauge pressure of3.15Ã—105 PaPa and temperature of37.0 âˆ˜Câˆ˜C. The tank has a small leak, and in time some of theoxygen leaks out. On a day when the temperature is 21.0 âˆ˜Câˆ˜C,the gauge pressure of the oxygen in the tank is1.90Ã—105 PaPa .Part A: Find the initial mass of oxygen.Part B:Find the mass of oxygen that has leaked out.

A welder using a tank of volume 7.90Ã—10âˆ’2 m3m3 fills it with oxygen (with a molar mass of 32.0 g/molg/mol ) at a gauge pressure of 3.15Ã—105 PaPa and temperature of 37.0 âˆ˜Câˆ˜C. The tank has a small leak, and in time some of the oxygen leaks out. On a day when the temperature is 21.0 âˆ˜Câˆ˜C, the gauge pressure of the oxygen in the tank is 1.90Ã—105 PaPa . Part A: Find the initial mass of oxygen. Part B: Find the mass of oxygen that has leaked out.

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