two students use hot plates to boil water in open flasks. The flasks are identic

Question

two students use hot plates to boil water in open flasks. The flasks are identical but flask 1 is one- quarter full of water while flask 2 is three quarers full. Flask 1 is in a labatory room on campus at a temperature of 20 Celcius. Flask 2 is in a w alk in refrigerated room at the d inning hall at a temperature of 1 Degree Celcius. The pressure in each room is 1 atm

Each flask is boiled vigorusly for several minutes. In this process the w ater vapor pushes all the airo of the flasks. The flasks are removed from the hot plates and immediately sealed with tight fiting covers.
A long time after the flasks are sealed is the pressure greater less than or qual to the pressure in side flask 2

Explanation / Answer

The vapour pressure exerted by a liquid depends upon the temperature only.

So taking different volume of water will not affect it.

1. When we started heating the water which was at differnt temperature will required same temperature ( different rise form 25 to 100 and 1 to 100) to boil as the atmospheric pressure is same. Boiling point is the temperature at which the vapour pressure of a liquid becomes equal to atm pressure.

2. After boiling when we closed it , and the flasks are not thermally insulated then the vapour pressure of second flask (at low temperature) will be less as the vapours will condense back to water in that more easily and rapidly as compared to other flask.

3. The pressure in flask is just because of vapour pressure so the pressure of flask to will be less than the flask 1.

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