<span>is a measure of the average kinetic energy of a group of molecules I think its true</span>
I would suggest you to use this instead.
Just place the known substance for example O2 Oxygen as they are asking you, and see where the diagram takes you.
So the answer would be 2 because you’d look at the coefficients of the balanced equation up there. H2O
I hope that was helpful, if you have more questions please ask!
Explanation:
The gas that would behave least ideally is CO