Karen W.

asked • 08/20/18

Decreasing the temperature of an ideal gas at a constant mass will cause which of the following to decrease?

I: Molar mass
II: The volume of the gas
III: The density of the gas 
IV: The average kinetic energy of the gas
V: The pressure of the gas
 
II, III, and IV
 
III, IV, and V
 
I, II, and III
 
II, IV, and V
 
II, III, IV, and V

1 Expert Answer

By:

Karen W.

What if the volume is constant?
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08/20/18

J.R. S.

tutor
If volume is constant then decreasing temperature wll
decrease pressure 
decrease kinetic energy
no change in molar mass
no change in volume
no change in density 
So none of the options fit. That’s why I’m not sure it’s constant volume. These questions are poorly written. 
 
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08/20/18

Karen W.

Hm thank you though this has been helpful. What if we were to look at the scenario where the volume is not constant 
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08/20/18

J.R. S.

tutor
Volume not constant, then decreasing temperature results in
-decrease in volume
-decrease in kinetic energy
-increase in density
-no change in molar mass
-no change in pressure (assuming volume changes in proportion to temperature)
 
Again none of the answers match. Maybe some one else will have additional insight, but as far as I am concerned, the question is flawed. Sorry.  
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08/20/18

Seth L.

Dont worry you helped alot. I went with the answer III, IV and V since in ideal gas, there is no volume between particles 
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08/20/18

Karen W.

Me and Seth are both trying to do this but we are going with III, IV AND V
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08/20/18

J.R. S.

tutor
Ok. I’ll be curious because why would density DECREASE? Density is mass/unit volume. The mass doesn’t change and the volume has decrease, so density should increase. No?
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08/20/18

Karen W.

From our understanding in class, density rarely increases and decreases more. 
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08/20/18

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