(3) An open flask of air is cooled. Answer the following: (a) Under which conditions, before or after cooling, does the flask contain more gas molecules? Explain.  (b) Is the pressure in the flask at the lower temperature the same as, greater than, or less than the pressure in the flask before it was cooled? Explain.

Question
Asked May 3, 2019
(3) An open flask of air is cooled. Answer the following:
 
(a) Under which conditions, before or after cooling, does the flask contain more gas molecules? Explain.
 
 
(b) Is the pressure in the flask at the lower temperature the same as, greater than, or less than the pressure in the flask before it was cooled? Explain.
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Expert Answer

Step 1

a) After cooling, the flask contains more gas molecules. This is because, on cooling pressure of the gas decreases and thus contains more gas molecules in the flask. During heating, gas molecules gain energy and try to escape out of the flask. Therefore number of molecules will be less on heating.

Step 2

b) Before cooling, pressure of the gas is greater. After cooling the pressure of the gas is low.

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