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Safari File Edit View History Bookmarks Window Help webassign.net Physics question | Chegg.com CH 19 This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise The pressure gauge on a tank registers the gauge pressure, which is the difference between the interior pressure and exterior pressure. When the tank is full of oxygen (O2), it contains 10.5 kg of the gas at a gauge pressure of 40.5 atm. Determine the mass of oxygen that has been withdrawn from the tank when the pressure reading is 27.0 atm. Assume the temperature of the tank remains constant. Part 1 of 3 Conceptualize We estimate the mass of oxygen that has been withdrawn from the tank to be somewhat less than half of the original mass. Part 2 of 3 -Categorize We will use the ideal gas law and relate the mass to the number of moles. Part 3 of 3 - Analyze Using the ideal gas law PV-nRT to find the ratio between the final mass and the initial mass at constant volume and temperature, we have mi ni PV RT RTPV Pf Solving for the final mass gives the following. (Note: When using the ideal gas law, be sure to use the absolute pressure, not the gauge pressure.)

Explanation / Answer

Pf = 27 and Pi = 40.5

mf = mi*Pf/Pi = 7

delta m = mi - mf = 10.5 - 7 = 3.5 kg

you only confused Pf with Pi rest of the answer was correct

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