Hi, can someone please help me with questions 3 and 4 on this lab on Charle\'s L

Question

Hi, can someone please help me with questions 3 and 4 on this lab on Charle's Law.

I would also be very grateful if someone could go over the report to see if I made any mistakes.

Thank You :-)

Questions 1. Why can't we experimentally find the temperature where the gas goes to "0 volume Hint When a gas is cooled to low temperatures, what usually happens to the gas when ges is coded down to a las temperature 1 the atoms tend -ls con dense and move closer get her on thu having less energy to arand and trams liqui esa Then liquid to ges from 2. This experiment works reasonably with dry air. However, V2 and V3 were determined in the flask when water was present. Water vapor enters the atmosphere and adds a little to the volume. This is not a problem at the boiling temperature, since we used a dry flask. In order to apply a correction accounting for the water vapor, we can calculate corrected V2 and V3 The vapor pressure of water at room T is about 20 torr units or about (20/760) x 100 -2.6% of the total P. Thus the humid air has about 2.6% by volume of water vapor Multiply your V2 by 0.026 and determine whether it is a sufficiently significant quantity to subtract from the experimentally determined volume. If you think it is, plot a new point on the graph in a different color Show calculation of water vapor volume and subtract it from V 1122 L 2 a 2 x IO 3. What is the vapor pressure of water at 00C (See the CRCHandbook or the reference page on your lab notebook.) Do you think this is significant compared to the total pressure 4. The greatest sources of errors in this lab are a) student mishandling of the equipment and b) leaky rubber stopper & hose. If a student hold the hot flask in the air for a period of time before immersing it in the tub, what might happen to cause an error in the Vw.What effect would it have on Vw? Be specific in your answer

Explanation / Answer

3) Vapour pressure of water at zero degree celcius=4.6 torr

It is insignificant compared atmospheric pressure of 760 torr, as it is about 4.6/760=0.6% of total P and causes 0.6 % increase in volume of air.

4)If the flask is held in air then the temperature of the flask may change (decrease) ,so the amount of air expelled may become less (at lower temperature), so less water would enter the flask and hence low value of Vw.

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