Chegg Study Or Chego con O GASES -Understa nding pressure equilibrium and atmosp

Question

Chegg Study Or Chego con O GASES -Understa nding pressure equilibrium and atmospheric pre.. Each sketch below shows a flask with some gas and a poal of mercury in it. The gas is at a pressure of 1 stm. A bottom of the flask, and the mercury can freely flow in or out of this tube. (You can assume that there is so much more mercury in the pool than can fr into the tube that even if the J-tube is completely filled, the level of mercury in the pool won't change.) Notice also that in the left sketch the J-tube is open at its other end, so that air from the atmosphere can freely flow. On the other hand, in the right sketch the 1-tube is closed at its other end, and you should assume there is no gas between the mercury and the closed end of the tube. To answer this question, you must decide what the mercury level will be when the mercury finaly stops flowing in or out of the tube. By moving the liders back and forth, you'll see diferent levels of mercury in the J-tube. Select the final correct level for each sketch open tube U

Explanation / Answer

Open tube: Pressure of gas in flask is 1 atm. and tube is open to the atmospheric pressure, so the pressure of the atmosphere, which is 1 atm. pushing down the mercury. Pressure of gas in flask is 1 atm. and1atm pressure pushing it down, so the level of mercury is same in flask and tube.

Closed tube: In this case no gas is pushing down the mercury, because tube is not open to atmosphere.

1 atm. = 760 mmHg

1 atm. = 0.760 m Hg

Pressure of gas in flask is 1 atm. and the level of mercury in flask is 1.5 m. The level of mercury in tube is 0.760 m above than flask.

The mercury rises in tube 1.5 m + 0.760 m = 2.26 m

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