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80. Which gas behaves most like an ideal gas?  
   
A. oxygen Ideal gases do not exist.   They would have to meet two conditions.

1.   No volume for the individual molecules.
2.   No attraction between molecules.

Helium becomes the closest to meeting these conditions. 
It is the smallest gas molecule.
It is the noblest of the noble gases and has the least attraction between molecules.

The Correct Answer is D.

B. ammonia
C. carbon dioxide
D. helium